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431746 | https://en.wikipedia.org/wiki/Amphipoda | Amphipoda | Amphipoda () is an order of malacostracan crustaceans with no carapace and generally with laterally compressed bodies. Amphipods () range in size from and are mostly detritivores or scavengers. There are more than 9,900 amphipod species so far described. They are mostly marine animals, but are found in almost all aqua... | Biology and health sciences | Malacostraca | Animals |
432097 | https://en.wikipedia.org/wiki/Hoe%20%28tool%29 | Hoe (tool) | A hoe is an ancient and versatile agricultural and horticultural hand tool used to shape soil, remove weeds, clear soil, and harvest root crops. Shaping the soil includes piling soil around the base of plants (hilling), digging narrow furrows (drills) and shallow trenches for planting seeds or bulbs. Weeding with a hoe... | Technology | Agricultural tools | null |
432138 | https://en.wikipedia.org/wiki/Growing%20season | Growing season | A season is a division of the year marked by changes in weather, ecology, and the amount of daylight. The growing season is that portion of the year in which local conditions (i.e. rainfall, temperature, daylight) permit normal plant growth. While each plant or crop has a specific growing season that depends on its gen... | Technology | Basics_2 | null |
432174 | https://en.wikipedia.org/wiki/Mulch | Mulch | A mulch is a layer of material applied to the surface of soil. Reasons for applying mulch include conservation of soil moisture, improving fertility and health of the soil, reducing weed growth, and enhancing the visual appeal of the area.
A mulch is usually, but not exclusively, organic in nature. It may be permanent... | Technology | Soil and soil management | null |
432181 | https://en.wikipedia.org/wiki/Lewis%20structure | Lewis structure | Lewis structuresalso called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs)are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule. Introduced by Gilbert N. Lewis in his 1916 article ... | Physical sciences | Substance | Chemistry |
432632 | https://en.wikipedia.org/wiki/Supergravity | Supergravity | In theoretical physics, supergravity (supergravity theory; SUGRA for short) is a modern field theory that combines the principles of supersymmetry and general relativity; this is in contrast to non-gravitational supersymmetric theories such as the Minimal Supersymmetric Standard Model. Supergravity is the gauge theory ... | Physical sciences | Particle physics: General | Physics |
14260687 | https://en.wikipedia.org/wiki/Mobile%20operating%20system | Mobile operating system | A mobile operating system is an operating system used for smartphones, tablets, smartwatches, smartglasses, or other non-laptop personal mobile computing devices. While computers such as typical/mobile laptops are "mobile", the operating systems used on them are usually not considered mobile, as they were originally de... | Technology | Computer hardware | null |
231504 | https://en.wikipedia.org/wiki/Glaciology | Glaciology | Glaciology (; ) is the scientific study of glaciers, or, more generally, ice and natural phenomena that involve ice.
Glaciology is an interdisciplinary Earth science that integrates geophysics, geology, physical geography, geomorphology, climatology, meteorology, hydrology, biology, and ecology. The impact of glaciers... | Physical sciences | Glaciology | Earth science |
231630 | https://en.wikipedia.org/wiki/Plasmon | Plasmon | In physics, a plasmon is a quantum of plasma oscillation. Just as light (an optical oscillation) consists of photons, the plasma oscillation consists of plasmons. The plasmon can be considered as a quasiparticle since it arises from the quantization of plasma oscillations, just like phonons are quantizations of mechani... | Physical sciences | Basics_2 | Physics |
231728 | https://en.wikipedia.org/wiki/Humpback%20whale | Humpback whale | The humpback whale (Megaptera novaeangliae) is a species of baleen whale. It is a rorqual (a member of the family Balaenopteridae) and is the only species in the genus Megaptera. Adults range in length from and weigh up to . The humpback has a distinctive body shape, with long pectoral fins and tubercles on its head. ... | Biology and health sciences | Cetaceans | null |
231826 | https://en.wikipedia.org/wiki/Seismometer | Seismometer | A seismometer is an instrument that responds to ground displacement and shaking such as caused by quakes, volcanic eruptions, and explosions. They are usually combined with a timing device and a recording device to form a seismograph. The output of such a device—formerly recorded on paper (see picture) or film, now rec... | Technology | Measuring instruments | null |
231920 | https://en.wikipedia.org/wiki/Scheduling%20%28computing%29 | Scheduling (computing) | In computing, scheduling is the action of assigning resources to perform tasks. The resources may be processors, network links or expansion cards. The tasks may be threads, processes or data flows.
The scheduling activity is carried out by a mechanism called a scheduler. Schedulers are often designed so as to keep all... | Technology | Operating systems | null |
232234 | https://en.wikipedia.org/wiki/Gonorynchiformes | Gonorynchiformes | The Gonorynchiformes are an order of ray-finned fish that includes the important food source, the milkfish (Chanos chanos, family Chanidae), and a number of lesser-known types, both marine and freshwater.
The alternate spelling "Gonorhynchiformes", with an "h", is frequently seen but not official.
Gonorynchiformes h... | Biology and health sciences | Gonorynchiformes | Animals |
232241 | https://en.wikipedia.org/wiki/Milkfish | Milkfish | The milkfish (Chanos chanos) is a widespread species of ray-finned fish found throughout the Indo-Pacific. It is the sole living species in the family Chanidae, and the only living member of the genus Chanos.
The repeating scientific name (tautonym) is from Greek ( ‘mouth’). They are grouped in the order Gonorhynchifo... | Biology and health sciences | Fishes | null |
232244 | https://en.wikipedia.org/wiki/Sacrum | Sacrum | The sacrum (: sacra or sacrums), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30.
The sacrum situates at the upper, back part of the pelvic cavity, between the two wings of the pelvis. It forms joints with four other ... | Biology and health sciences | Skeletal system | Biology |
232249 | https://en.wikipedia.org/wiki/Crystal%20radio | Crystal radio | A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power. It is named for its most important component, a crystal detector, originally made from a piece of crystall... | Technology | Broadcasting | null |
232411 | https://en.wikipedia.org/wiki/Sneeze | Sneeze | A sneeze (also known as sternutation) is a semi-autonomous, convulsive expulsion of air from the lungs through the nose and mouth, usually caused by foreign particles irritating the nasal mucosa. A sneeze expels air forcibly from the mouth and nose in an explosive, spasmodic involuntary action. This action allows for m... | Biology and health sciences | Symptoms and signs | Health |
232426 | https://en.wikipedia.org/wiki/Classification | Classification | Classification is the activity of assigning objects to some pre-existing classes or categories. This is distinct from the task of establishing the classes themselves (for example through cluster analysis). Examples include diagnostic tests, identifying spam emails and deciding whether to give someone a driving license.... | Physical sciences | Science basics | Basics and measurement |
232535 | https://en.wikipedia.org/wiki/Hypergraph | Hypergraph | In mathematics, a hypergraph is a generalization of a graph in which an edge can join any number of vertices. In contrast, in an ordinary graph, an edge connects exactly two vertices.
Formally, a directed hypergraph is a pair , where is a set of elements called nodes, vertices, points, or elements and is a set of pa... | Mathematics | Graph theory | null |
232867 | https://en.wikipedia.org/wiki/Hamstring | Hamstring | A hamstring () is any one of the three posterior thigh muscles in human anatomy between the hip and the knee: from medial to lateral, the semimembranosus, semitendinosus and biceps femoris.
Etymology
The word "ham" is derived from the Old English ham or hom meaning the hollow or bend of the knee, from a Germanic base ... | Biology and health sciences | Human anatomy | Health |
233027 | https://en.wikipedia.org/wiki/Cubic%20foot | Cubic foot | The cubic foot (symbol ft3 or cu ft) is an imperial and US customary (non-metric) unit of volume, used in the United States and the United Kingdom. It is defined as the volume of a cube with sides of one foot () in length. Its volume is (about of a cubic metre).
Conversions
Symbols and abbreviations
The IEEE symbo... | Physical sciences | Volume | Basics and measurement |
233076 | https://en.wikipedia.org/wiki/Reconnaissance%20aircraft | Reconnaissance aircraft | A reconnaissance aircraft (colloquially, a spy plane) is a military aircraft designed or adapted to perform aerial reconnaissance with roles including collection of imagery intelligence (including using photography), signals intelligence, as well as measurement and signature intelligence. Modern technology has also en... | Technology | Military aviation | null |
233082 | https://en.wikipedia.org/wiki/Burn | Burn | A burn is an injury to skin, or other tissues, caused by heat, cold, electricity, chemicals, friction, or ionizing radiation (such as sunburn, caused by ultraviolet radiation). Most burns are due to heat from hot liquids (called scalding), solids, or fire. Burns occur mainly in the home or the workplace. In the home, r... | Biology and health sciences | Injury | null |
233089 | https://en.wikipedia.org/wiki/Polyvinyl%20acetate | Polyvinyl acetate | Polyvinyl acetate (PVA, PVAc, poly(ethenyl ethanoate)), commonly known as wood glue (a term that may also refer to other types of glues), PVA glue, white glue, carpenter's glue, school glue, or Elmer's Glue in the US, is a widely available adhesive used for porous materials like wood, paper, and cloth. An aliphatic rub... | Physical sciences | Polymers | Chemistry |
233217 | https://en.wikipedia.org/wiki/Tiger%20shark | Tiger shark | The tiger shark (Galeocerdo cuvier) is a species of ground shark, and the only extant member of the genus Galeocerdo and family Galeocerdonidae. It is a large macropredator, with females capable of attaining a length of over . Populations are found in many tropical and temperate waters, especially around central Pacifi... | Biology and health sciences | Sharks | null |
233253 | https://en.wikipedia.org/wiki/Umbilical%20cord | Umbilical cord | In placental mammals, the umbilical cord (also called the navel string, birth cord or funiculus umbilicalis) is a conduit between the developing embryo or fetus and the placenta. During prenatal development, the umbilical cord is physiologically and genetically part of the fetus and (in humans) normally contains two ar... | Biology and health sciences | Animal ontogeny | Biology |
233271 | https://en.wikipedia.org/wiki/Brown%20algae | Brown algae | Brown algae (: alga) are a large group of multicellular algae comprising the class Phaeophyceae. They include many seaweeds located in colder waters of the Northern Hemisphere. Brown algae are the major seaweeds of the temperate and polar regions. Many brown algae, such as members of the order Fucales, commonly grow al... | Biology and health sciences | Other organisms | null |
233281 | https://en.wikipedia.org/wiki/Cementite | Cementite | Cementite (or iron carbide) is a compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe3C. By weight, it is 6.67% carbon and 93.3% iron. It has an orthorhombic crystal structure. It is a hard, brittle material, normally classified as a ceramic in its pure form, and is a... | Physical sciences | Ceramic compounds | Chemistry |
233403 | https://en.wikipedia.org/wiki/Siege%20engine | Siege engine | A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification. There are... | Technology | Military technology: General | null |
233488 | https://en.wikipedia.org/wiki/Machine%20learning | Machine learning | Machine learning (ML) is a field of study in artificial intelligence concerned with the development and study of statistical algorithms that can learn from data and generalize to unseen data, and thus perform tasks without explicit instructions. Within a subdiscipline in machine learning, advances in the field of deep ... | Technology | Artificial intelligence concepts | null |
233528 | https://en.wikipedia.org/wiki/Brainstem | Brainstem | The brainstem (or brain stem) is the posterior stalk-like part of the brain that connects the cerebrum with the spinal cord. In the human brain the brainstem is composed of the midbrain, the pons, and the medulla oblongata. The midbrain is continuous with the thalamus of the diencephalon through the tentorial notch, an... | Biology and health sciences | Nervous system | null |
233529 | https://en.wikipedia.org/wiki/Aftershock | Aftershock | In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitu... | Physical sciences | Seismology | Earth science |
233579 | https://en.wikipedia.org/wiki/Dormancy | Dormancy | Dormancy is a period in an organism's life cycle when growth, development, and (in animals) physical activity are temporarily stopped. This minimizes metabolic activity and therefore helps an organism to conserve energy. Dormancy tends to be closely associated with environmental conditions. Organisms can synchronize en... | Biology and health sciences | Ethology | Biology |
233609 | https://en.wikipedia.org/wiki/Pollination | Pollination | Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds. Pollinating agents can be animals such as insects, for example beetles or butterflies; birds, and bats; water; wind; and even plants themselves. Pollinating animals travel ... | Biology and health sciences | Plant reproduction | null |
233636 | https://en.wikipedia.org/wiki/Spherical%20Earth | Spherical Earth | Spherical Earth or Earth's curvature refers to the approximation of the figure of the Earth to a sphere. The concept of a spherical Earth gradually displaced earlier beliefs in a flat Earth during classical antiquity and the Middle Ages. The figure of the Earth is more accurately described as an ellipsoid, which was re... | Physical sciences | Earth science basics: General | Earth science |
233656 | https://en.wikipedia.org/wiki/Chiton | Chiton | Chitons () are marine molluscs of varying size in the class Polyplacophora ( ), formerly known as Amphineura. About 940 extant and 430 fossil species are recognized.
They are also sometimes known as sea cradles or coat-of-mail shells or suck-rocks, or more formally as loricates, polyplacophorans, and occasionally as p... | Biology and health sciences | Mollusks | Animals |
233668 | https://en.wikipedia.org/wiki/Figure%20of%20the%20Earth | Figure of the Earth | In geodesy, the figure of the Earth is the size and shape used to model planet Earth. The kind of figure depends on application, including the precision needed for the model. A spherical Earth is a well-known historical approximation that is satisfactory for geography, astronomy and many other purposes. Several models ... | Physical sciences | Earth science basics: General | Earth science |
234098 | https://en.wikipedia.org/wiki/Herbaceous%20plant | Herbaceous plant | Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials.
Definitions of "herb" and "herbaceous"
The fourth edition of the Shorter Oxford English Dictionary defines "herb" as:
"A plant whose ste... | Biology and health sciences | Plant anatomy and morphology: General | Biology |
234101 | https://en.wikipedia.org/wiki/Thigh | Thigh | In anatomy, the thigh is the area between the hip (pelvis) and the knee. Anatomically, it is part of the lower limb.
The single bone in the thigh is called the femur. This bone is very thick and strong (due to the high proportion of bone tissue), and forms a ball and socket joint at the hip, and a modified hinge joint... | Biology and health sciences | Human anatomy | Health |
234143 | https://en.wikipedia.org/wiki/Seagrass | Seagrass | Seagrasses are the only flowering plants which grow in marine environments. There are about 60 species of fully marine seagrasses which belong to four families (Posidoniaceae, Zosteraceae, Hydrocharitaceae and Cymodoceaceae), all in the order Alismatales (in the clade of monocotyledons). Seagrasses evolved from terrest... | Biology and health sciences | Alismatales | Plants |
234226 | https://en.wikipedia.org/wiki/Traffic%20congestion | Traffic congestion | Traffic congestion is a condition in transport that is characterized by slower speeds, longer trip times, and increased vehicular queueing. Traffic congestion on urban road networks has increased substantially since the 1950s, resulting in many of the roads becoming obsolete. When traffic demand is great enough that th... | Technology | Basics_7 | null |
31161 | https://en.wikipedia.org/wiki/Tsunami | Tsunami | A tsunami ( ; from , ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and underwater explosions (including detonations, landslides, glacier calvings, meteorite impacts and other disturbances) above or bel... | Physical sciences | Natural disasters | null |
31185 | https://en.wikipedia.org/wiki/Tonne | Tonne | The tonne ( or ; symbol: t) is a unit of mass equal to 1,000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton in the United States to distinguish it from the non-metric units of the short ton (United States customary units) and the long ton (British imperial units). It is ... | Physical sciences | Mass and weight | Basics and measurement |
31188 | https://en.wikipedia.org/wiki/Triassic%E2%80%93Jurassic%20extinction%20event | Triassic–Jurassic extinction event | The Triassic–Jurassic (Tr-J) extinction event (TJME), often called the end-Triassic extinction, marks the boundary between the Triassic and Jurassic periods, . It is one of five major extinction events, profoundly affecting life on land and in the oceans. In the seas, about 23–34% of marine genera disappeared. On land,... | Physical sciences | Geological history | null |
31199 | https://en.wikipedia.org/wiki/Trireme | Trireme | A trireme ( ; ; cf. ) was an ancient vessel and a type of galley that was used by the ancient maritime civilizations of the Mediterranean Sea, especially the Phoenicians, ancient Greeks and Romans.
The trireme derives its name from its three rows of oars, manned with one man per oar. The early trireme was a developmen... | Technology | Naval warfare | null |
31248 | https://en.wikipedia.org/wiki/Travelling%20salesman%20problem | Travelling salesman problem | In the theory of computational complexity, the travelling salesman problem (TSP) asks the following question: "Given a list of cities and the distances between each pair of cities, what is the shortest possible route that visits each city exactly once and returns to the origin city?" It is an NP-hard problem in combina... | Mathematics | Graph theory | null |
31260 | https://en.wikipedia.org/wiki/Titration | Titration | Titration (also known as titrimetry and volumetric analysis) is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed). A reagent, termed the titrant or titrator, is prepared as a standard solution of known concentration and volu... | Physical sciences | Chemical methods | Chemistry |
31296 | https://en.wikipedia.org/wiki/Tachyon | Tachyon | A tachyon () or tachyonic particle is a hypothetical particle that always travels faster than light. Physicists believe that faster-than-light particles cannot exist because they are inconsistent with the known laws of physics. If such particles did exist they could be used to send signals faster than light and into th... | Physical sciences | Subatomic particles: General | Physics |
31302 | https://en.wikipedia.org/wiki/Taiga | Taiga | Taiga or tayga ( ; , ), also known as boreal forest or snow forest, is a biome characterized by coniferous forests consisting mostly of pines, spruces, and larches. The taiga, or boreal forest, is the world's largest land biome. In North America, it covers most of inland Canada, Alaska, and parts of the northern contig... | Physical sciences | Forests | null |
31306 | https://en.wikipedia.org/wiki/Tritium | Tritium | Tritium () or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with a half-life of ~12.3 years. The tritium nucleus (t, sometimes called a triton) contains one proton and two neutrons, whereas the nucleus of the common isotope hydrogen-1 (protium) contains one proton and no neutrons, and that of... | Physical sciences | s-Block | Chemistry |
31307 | https://en.wikipedia.org/wiki/Tau%20Ceti | Tau Ceti | Tau Ceti, Latinized from τ Ceti, is a single star in the constellation Cetus that is spectrally similar to the Sun, although it has only about 78% of the Sun's mass. At a distance of just under from the Solar System, it is a relatively nearby star and the closest solitary G-class star. The star appears stable, with li... | Physical sciences | Notable stars | Astronomy |
31349 | https://en.wikipedia.org/wiki/Tyrosine | Tyrosine | -Tyrosine or tyrosine (symbol Tyr or Y) or 4-hydroxyphenylalanine is one of the 20 standard amino acids that are used by cells to synthesize proteins. It is a conditionally essential amino acid with a polar side group. The word "tyrosine" is from the Greek tyrós, meaning cheese, as it was first discovered in 1846 by Ge... | Biology and health sciences | Amino acids | Biology |
31373 | https://en.wikipedia.org/wiki/Tor%20%28rock%20formation%29 | Tor (rock formation) | A tor, which is also known by geomorphologists as either a castle koppie or kopje, is a large, free-standing rock outcrop that rises abruptly from the surrounding smooth and gentle slopes of a rounded hill summit or ridge crest. In the South West of England, the term is commonly also used for the hills themselves – par... | Physical sciences | Other erosional landforms | Earth science |
31383 | https://en.wikipedia.org/wiki/Osmotic%20pressure | Osmotic pressure | Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane.
It is also defined as the measure of the tendency of a solution to take in its pure solvent by osmosis. Potential osmotic pressure is the maximum osmotic press... | Physical sciences | Thermodynamics | Chemistry |
31392 | https://en.wikipedia.org/wiki/Tasmanian%20devil | Tasmanian devil | The Tasmanian devil (Sarcophilus harrisii) (palawa kani: purinina) is a carnivorous marsupial of the family Dasyuridae. It was formerly present across mainland Australia, but became extinct there around 3,500 years ago; it is now confined to the island of Tasmania. The size of a small dog, the Tasmanian devil became th... | Biology and health sciences | Marsupials | null |
31415 | https://en.wikipedia.org/wiki/Topaz | Topaz | Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula AlSiO(F, OH). It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. Topaz is often treated with ... | Physical sciences | Silicate minerals | Earth science |
31418 | https://en.wikipedia.org/wiki/Thermobaric%20weapon | Thermobaric weapon | A thermobaric weapon, also called an aerosol bomb, or a vacuum bomb, is a type of explosive munition that works by dispersing an aerosol cloud of gas, liquid or powdered explosive. The fuel is usually a single compound, rather than a mixture of multiple substances. Many types of thermobaric weapons can be fitted to han... | Technology | Explosive weapons | null |
31422 | https://en.wikipedia.org/wiki/Talc | Talc | Talc, or talcum, is a clay mineral composed of hydrated magnesium silicate, with the chemical formula . Talc in powdered form, often combined with corn starch, is used as baby powder. This mineral is used as a thickening agent and lubricant. It is an ingredient in ceramics, paints, and roofing material. It is a main in... | Physical sciences | Mineralogy | null |
31424 | https://en.wikipedia.org/wiki/Torpedo | Torpedo | A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, such a device was called an automotive, automobile, locomotive, or fish torpe... | Technology | Naval warfare | null |
31428 | https://en.wikipedia.org/wiki/Tourmaline | Tourmaline | Tourmaline ( ) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. This gemstone comes in a wide variety of colors.
The name is derived from the Sinhalese (), which refers to the carnelian gemstones.
History
Brightly c... | Physical sciences | Silicate minerals | Earth science |
31429 | https://en.wikipedia.org/wiki/Twin%20paradox | Twin paradox | In physics, the twin paradox is a thought experiment in special relativity involving twins, one of whom takes a space voyage at relativistic speeds and returns home to find that the twin who remained on Earth has aged more. This result appears puzzling because each twin sees the other twin as moving, and so, as a conse... | Physical sciences | Theory of relativity | Physics |
31439 | https://en.wikipedia.org/wiki/Tokamak | Tokamak | A tokamak (; ) is a device which uses a powerful magnetic field generated by external magnets to confine plasma in the shape of an axially symmetrical torus. The tokamak is one of several types of magnetic confinement devices being developed to produce controlled thermonuclear fusion power. The tokamak concept is curr... | Technology | Power generation | null |
31456 | https://en.wikipedia.org/wiki/Truck | Truck | A truck or lorry is a motor vehicle designed to transport freight, carry specialized payloads, or perform other utilitarian work. Trucks vary greatly in size, power, and configuration, but the vast majority feature body-on-frame construction, with a cabin that is independent of the payload portion of the vehicle. Small... | Technology | Road transport | null |
31474 | https://en.wikipedia.org/wiki/Transcription%20factor | Transcription factor | In molecular biology, a transcription factor (TF) (or sequence-specific DNA-binding factor) is a protein that controls the rate of transcription of genetic information from DNA to messenger RNA, by binding to a specific DNA sequence. The function of TFs is to regulate—turn on and off—genes in order to make sure that th... | Biology and health sciences | Molecular biology | Biology |
31482 | https://en.wikipedia.org/wiki/Tangent | Tangent | In geometry, the tangent line (or simply tangent) to a plane curve at a given point is, intuitively, the straight line that "just touches" the curve at that point. Leibniz defined it as the line through a pair of infinitely close points on the curve. More precisely, a straight line is tangent to the curve at a point ... | Mathematics | Two-dimensional space | null |
31491 | https://en.wikipedia.org/wiki/Theoretical%20chemistry | Theoretical chemistry | Theoretical chemistry is the branch of chemistry which develops theoretical generalizations that are part of the theoretical arsenal of modern chemistry: for example, the concepts of chemical bonding, chemical reaction, valence, the surface of potential energy, molecular orbitals, orbital interactions, and molecule act... | Physical sciences | Subdisciplines | Chemistry |
31537 | https://en.wikipedia.org/wiki/Transuranium%20element | Transuranium element | The transuranium (or transuranic) elements are the chemical elements with atomic number greater than 92, which is the atomic number of uranium. All of them are radioactively unstable and decay into other elements. Except for neptunium and plutonium, which have been found in trace amounts in nature, none occur naturally... | Physical sciences | Periods | Chemistry |
31596 | https://en.wikipedia.org/wiki/Typhoid%20fever | Typhoid fever | Typhoid fever, also known simply as typhoid, is a disease caused by Salmonella enterica serotype Typhi bacteria, also called Salmonella Typhi. Symptoms vary from mild to severe, and usually begin six to 30 days after exposure. Often there is a gradual onset of a high fever over several days. This is commonly accompanie... | Biology and health sciences | Infectious disease | null |
31734 | https://en.wikipedia.org/wiki/Urea | Urea | Urea, also called carbamide (because it is a diamide of carbonic acid), is an organic compound with chemical formula . This amide has two amino groups (–) joined by a carbonyl functional group (–C(=O)–). It is thus the simplest amide of carbamic acid.
Urea serves an important role in the cellular metabolism of nitroge... | Physical sciences | Carbon–nitrogen bond | null |
31736 | https://en.wikipedia.org/wiki/Uric%20acid | Uric acid | Uric acid is a heterocyclic compound of carbon, nitrogen, oxygen, and hydrogen with the formula C5H4N4O3. It forms ions and salts known as urates and acid urates, such as ammonium acid urate. Uric acid is a product of the metabolic breakdown of purine nucleotides, and it is a normal component of urine. High blood conce... | Physical sciences | Alkaloids | Chemistry |
31742 | https://en.wikipedia.org/wiki/Unicode | Unicode | Unicode, formally The Unicode Standard, is a text encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 of the standard defines characters and 168 scripts used in various ordinary, literary, academic, and tec... | Technology | Software development: General | null |
31743 | https://en.wikipedia.org/wiki/Uranium | Uranium | Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium radioactively decays, usually by emitting an alpha particle. The half-life of this deca... | Physical sciences | Chemical elements_2 | null |
31744 | https://en.wikipedia.org/wiki/Ungulate | Ungulate | Ungulates ( ) are members of the diverse clade Euungulata ("true ungulates"), which primarily consists of large mammals with hooves. Once part of the clade "Ungulata" along with the clade Paenungulata, "Ungulata" has since been determined to be a polyphyletic and thereby invalid clade based on molecular data. As a resu... | Biology and health sciences | Mammals: General | Animals |
31772 | https://en.wikipedia.org/wiki/Ursa%20Major | Ursa Major | Ursa Major, also known as the Great Bear, is a constellation in the northern sky, whose associated mythology likely dates back into prehistory. Its Latin name means "greater (or larger) bear", referring to and contrasting it with nearby Ursa Minor, the lesser bear. In antiquity, it was one of the original 48 constellat... | Physical sciences | Constellations | null |
31773 | https://en.wikipedia.org/wiki/Ursa%20Minor | Ursa Minor | Ursa Minor (, contrasting with Ursa Major), also known as the Little Bear, is a constellation located in the far northern sky. As with the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the North American name, Little Dipper: seven stars with four in its bowl like its partner t... | Physical sciences | Constellations | null |
31780 | https://en.wikipedia.org/wiki/Ultrasound | Ultrasound | Ultrasound is sound with frequencies greater than 20 kilohertz. This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to seve... | Physical sciences | Waves | null |
31863 | https://en.wikipedia.org/wiki/Uterus | Uterus | The uterus (from Latin uterus, : uteri or uteruses) or womb () is the organ in the reproductive system of most female mammals, including humans, that accommodates the embryonic and fetal development of one or more fertilized eggs until birth. The uterus is a hormone-responsive sex organ that contains glands in its lini... | Biology and health sciences | Reproductive system | null |
31880 | https://en.wikipedia.org/wiki/Universe | Universe | The universe is all of space and time and their contents. It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments. Since the early 20th century, ... | Physical sciences | Science and medicine | null |
31883 | https://en.wikipedia.org/wiki/Uncertainty%20principle | Uncertainty principle | The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known. In other words, the more accurately ... | Physical sciences | Quantum mechanics | null |
31888 | https://en.wikipedia.org/wiki/U-boat | U-boat | U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. The term is an anglicized version of the German word , a shortening of (under-sea boat), though the German term refers to any submarine. Austro-Hungarian Navy submarines were also known as U-boats.
U-boats are most kn... | Technology | Naval warfare | null |
31911 | https://en.wikipedia.org/wiki/Ultrafilter | Ultrafilter | In the mathematical field of order theory, an ultrafilter on a given partially ordered set (or "poset") is a certain subset of namely a maximal filter on that is, a proper filter on that cannot be enlarged to a bigger proper filter on
If is an arbitrary set, its power set ordered by set inclusion, is always a B... | Mathematics | Order theory | null |
31990 | https://en.wikipedia.org/wiki/Ultraviolet | Ultraviolet | Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by ... | Physical sciences | Electrodynamics | null |
32055 | https://en.wikipedia.org/wiki/Urology | Urology | Urology (from Greek οὖρον ouron "urine" and -logia "study of"), also known as genitourinary surgery, is the branch of medicine that focuses on surgical and medical diseases of the urinary system and the reproductive organs. Organs under the domain of urology include the kidneys, adrenal glands, ureters, urinary bladde... | Biology and health sciences | Fields of medicine | null |
32073 | https://en.wikipedia.org/wiki/USB | USB | Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), that allows data exchange and delivery of power between many types of electronics. It specifies its architecture, in particular its physical interface, and communication protocols for data transfer and power delivery to an... | Technology | User interface | null |
32101 | https://en.wikipedia.org/wiki/Umbriel | Umbriel | Umbriel () is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell at the same time as neighboring moon Ariel. It was named after a character in Alexander Pope's 1712 poem The Rape of the Lock. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differen... | Physical sciences | Solar System | Astronomy |
32133 | https://en.wikipedia.org/wiki/Urethra | Urethra | The urethra (: urethras or urethrae) is the tube that connects the urinary bladder to the urinary meatus, through which placental mammals urinate and ejaculate. In non-mammalian vertebrates, the urethra also transports semen but is separate from the urinary tract.
The external urethral sphincter is a striated muscle t... | Biology and health sciences | Urinary system | Biology |
32161 | https://en.wikipedia.org/wiki/Urinary%20tract%20infection | Urinary tract infection | A urinary tract infection (UTI) is an infection that affects a part of the urinary tract. Lower urinary tract infections may involve the bladder (cystitis) or urethra (urethritis) while upper urinary tract infections affect the kidney (pyelonephritis). Symptoms from a lower urinary tract infection include suprapubic pa... | Biology and health sciences | Infectious diseases by site | Health |
32167 | https://en.wikipedia.org/wiki/Ubiquitin | Ubiquitin | Ubiquitin is a small (8.6 kDa) regulatory protein found in most tissues of eukaryotic organisms, i.e., it is found ubiquitously. It was discovered in 1975 by Gideon Goldstein and further characterized throughout the late 1970s and 1980s. Four genes in the human genome code for ubiquitin: UBB, UBC, UBA52 and RPS27A.
Th... | Biology and health sciences | Molecular biology | Biology |
32188 | https://en.wikipedia.org/wiki/UTF-8 | UTF-8 | UTF-8 is a character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from Unicode Transformation Format 8-bit. Almost every webpage is stored in UTF-8.
UTF-8 is capable of encoding all 1,112,064 valid Unicode scalar values using a variable-width encoding of one... | Technology | Software development: General | null |
32197 | https://en.wikipedia.org/wiki/USS%20Monitor | USS Monitor | USS Monitor was an ironclad warship built for the United States Navy during the American Civil War and completed in early 1862, the first such ship commissioned by the Navy. Monitor played a central role in the Battle of Hampton Roads on 9 March under the command of Lieutenant John L. Worden, where she fought the casem... | Technology | Specific seacraft | null |
32245 | https://en.wikipedia.org/wiki/Universal%20property | Universal property | In mathematics, more specifically in category theory, a universal property is a property that characterizes up to an isomorphism the result of some constructions. Thus, universal properties can be used for defining some objects independently from the method chosen for constructing them. For example, the definitions of... | Mathematics | Category theory | null |
32259 | https://en.wikipedia.org/wiki/Bladder | Bladder | The bladder () is a hollow organ in humans and other vertebrates that stores urine from the kidneys. In placental mammals, urine enters the bladder via the ureters and exits via the urethra during urination. In humans, the bladder is a distensible organ that sits on the pelvic floor. The typical adult human bladder wil... | Biology and health sciences | Urinary system | null |
32298 | https://en.wikipedia.org/wiki/USS%20Constitution | USS Constitution | USS Constitution, also known as Old Ironsides, is a three-masted wooden-hulled heavy frigate of the United States Navy. She is the world's oldest commissioned naval warship still afloat. She was launched in 1797, one of six original frigates authorized for construction by the Naval Act of 1794 and the third constructed... | Technology | Specific seacraft | null |
32308 | https://en.wikipedia.org/wiki/United%20States%20customary%20units | United States customary units | United States customary units form a system of measurement units commonly used in the United States and most U.S. territories since being standardized and adopted in 1832. The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country... | Physical sciences | Measurement systems | null |
32344 | https://en.wikipedia.org/wiki/Variance | Variance | In probability theory and statistics, variance is the expected value of the squared deviation from the mean of a random variable. The standard deviation (SD) is obtained as the square root of the variance. Variance is a measure of dispersion, meaning it is a measure of how far a set of numbers is spread out from their ... | Mathematics | Statistics and probability | null |
32347 | https://en.wikipedia.org/wiki/Vacuole | Vacuole | A vacuole () is a membrane-bound organelle which is present in plant and fungal cells and some protist, animal, and bacterial cells. Vacuoles are essentially enclosed compartments which are filled with water containing inorganic and organic molecules including enzymes in solution, though in certain cases they may conta... | Biology and health sciences | Organelles and other cell parts | null |
32353 | https://en.wikipedia.org/wiki/Virtual%20machine | Virtual machine | In computing, a virtual machine (VM) is the virtualization or emulation of a computer system. Virtual machines are based on computer architectures and provide the functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination of the two.
Virtual machines differ... | Technology | Operating systems | null |
32354 | https://en.wikipedia.org/wiki/Virtual%20memory | Virtual memory | In computing, virtual memory, or virtual storage, is a memory management technique that provides an "idealized abstraction of the storage resources that are actually available on a given machine" which "creates the illusion to users of a very large (main) memory".
The computer's operating system, using a combination o... | Technology | Volatile memory | null |
32363 | https://en.wikipedia.org/wiki/Vostok%201 | Vostok 1 | Vostok 1 (, ) was the first spaceflight of the Vostok programme and the first human orbital spaceflight in history. The Vostok 3KA space capsule was launched from Baikonur Cosmodrome on 12 April 1961, with Soviet cosmonaut Yuri Gagarin aboard, making him the first human to reach orbital velocity around the Earth and to... | Technology | Crewed vehicles | null |
32370 | https://en.wikipedia.org/wiki/Vector%20space | Vector space | In mathematics and physics, a vector space (also called a linear space) is a set whose elements, often called vectors, can be added together and multiplied ("scaled") by numbers called scalars. The operations of vector addition and scalar multiplication must satisfy certain requirements, called vector axioms. Real vect... | Mathematics | Algebra | null |
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