Encyclopedia

Test Card J Test Card J is a test card, an image used to determine the quality of a broadcast television picture. It is an updated version of Test Card F, which was created by BBC engineer George Hersee, and it first appeared in November 1999.
Test data exclusivity Test data exclusivity refers to protection of clinical test data required to be submitted to a regulatory agency to prove safety and efficacy of a new drug, and prevention of generic drug manufacturers from relying on this data in their own applications. Pharmaceutical companies argue that since test data is so expensive to produce, it is an unfair advantage to let other companies rely on that data without cost.
Test de connaissance du français The Test de connaissance du français (TCF) is a language placement test for non-native speakers of French. It is administered by the Centre international d'études pédagogiques (CIEP) for the French Ministry of Education.
Test Dept Test Dept were an industrial music band formed in New Cross, London, by unemployed musicians (including Alastair Adams, Paul Jamrozy, Angus Farquhar, Graham Cunnington, Tony Cudlip, Toby Burdon and Paul Hines) from Glasgow, Scotland, where the band later re-located. Formed in 1981, they are hailed by many musicians as one of the most influential early industrial music acts.
Test Drive (video game) Test Drive is the name of one of the longest running racing game franchises ever. Originally published by Accolade, which was later bought by Infogrames, the first title saw the light of day in 1987 and has since been followed by a stream of sequels.
Test Drive 2: The Duel The Duel: Test Drive II is a cross-platform racing game developed by Distinctive Software and published by Accolade in 1989. The game belongs to the Test Drive series, and like its prequel, features driving exotic cars through dangerous highways, evading oncomming traffic while trying to escape police pursuits.
Test Drive Unlimited Test Drive Unlimited is an arcade-style racing game that features over 125 licensed sports cars and motorcycles and a terrain modelled after the Hawaiian island of Oahu that features some 1000 miles of roads and highways.
Test engineer A (hardware) test engineer (TE)is a professional who determines how to create a process that would test a particular product in manufacturing in order to guarantee that the product will be shipped out with good quality. Test engineers are also responsible for determining the best way a test can be performed in order to achieve 100% test coverage of all components using different test process.
Test For Echo Tour This was the first time Rush toured without an opening act; with the extra time available, "2112" was performed in its entirety for the first time ever (including 'Oracle'). After the first ten dates the setlist remained constant throughout the tour although it was broken up into two legs with a break in between (Fall '96 and Spring/Summer '97), with a similar but unique setlist for each leg.
Test charge A test charge is an object (usually a point particle) that has negligible charge; one can ignore the electrical field generated by the object itself. This concept is very useful when one wants to understand the properties of a given electrical field.
Test Icicles Test Icicles were a band formed in the UK, primarily influenced by hardcore and dance-punk, but containing musical elements from a variety of genres (notably Rapcore, Hip-hop, crossover thrash and funk). The band was formed in 2004 by Rory Atwell and Sam Mehran, and later joined by Devonte Hynes, who was originally invited to fill in at a performance in Brighton, England and afterward became a permanent member of the band.
Test market A test market, in the field of business and marketing, is a geographic region or demographic group used to gauge the viability of a product or service in the mass market prior to a wide scale roll-out. The criteria used to judge the acceptability of a test market region or group include:
Test match (football) A test match in football is a match played at the end of a season between a team that has done badly in a higher league and one that has done well in a lower league of the same football league system. The winner of the test match plays in the higher league the following year, and the loser in the lower league.
Test Manager Test Manager is a software tool designed by Marc-Elian BĂ©gin, from CERN. It was first created to help the gLite Grid middleware team at CERN to better manage the execution and visualisation of results of different tests, written in different languages and using different tools and frameworks.
Test Match Special Test Match Special (known as TMS) is a radio programme broadcast on BBC Radio 4 (long wave), Five Live Sports Extra (digital) and the internet to the UK and (where broadcasting rights permit) the rest of the world. TMS provides ball-by-ball coverage of many Test cricket and One Day International matches involving the England cricket team.
Test of Metal The Test of Metal is a 67-kilometre cross-country mountain bike race held annually in and around Squamish, British Columbia. The demanding course, with over 1,200 metres of climbing and 35 kilometres of singletrack, takes just under three hours for the fastest riders and between four and five hours for the majority of competitors.
Test of the Twins Time of the Twins is a fantasy novel by Margaret Weis and Tracy Hickman. It is the third and final book in the Dragonlance Legends, which along with the Dragonlance Chronicles are considered the core Dragonlance novels.
Test Of Friendship Test Of Friendship is the second aired episode of That's So Raven, starring Raven Symone, Orlando Brown and Anneliese van der Pol. Raven (played by Symone) gets a vision that her friend Eddie (Brown) is going to fail a Spanish test.
Test particle In physical theories, a test particle is an idealised model of a small object some of whose physical properties (usually mass and size) are assumed to be negligible. The concept of a test particle simplifies some problems, and often provides a good approximation for physical phenomena in a specified domain of applicability.
Test probe A test probe (test lead, test prod) is a physical device used to connect electronic test equipment to the device under test (DUT). They range from very simple, rugged devices to complex probes that are sophisticated, expensive, and fragile.
Test Pilot (film) Test Pilot is a 1938 film that tells the story of a test pilot (Clark Gable) and his wife (Myrna Loy), who unsuccessfully try to keep their best friend (a chronically gum-chewing Spencer Tracy), another test pilot, from drinking. The movie also features Lionel Barrymore.
Test script A test script is a short program written in a programming language used to test part of the functionality of a software system. A written set of steps that should be performed automatically can also be called a test script, however this is more correctly called a test case.
Test skill Test Skill is a game devoted to trying to correctly predict performances by individual cricket players in international cricket matches, where the best 4 performers from each team are selected by the tipster, and points are awarded depending on who scores the most runs, gets the most wickets and takes the most catches. Prizes are awarded for the best tipsters, including caps, mugs, iPods and even overseas holidays.
Test stamp A test stamp, dummy stamp, or training stamp, is a label resembling a postage stamp that is used by postal authorities for testing equipment and/or training postal workers. They generally have the same size and shape as regular stamps, but with a minimal design.
Test Stakes The Test Stakes is a race for thoroughbred horses open to three-year-old fillies and run each summer at the Saratoga Race Course in New York. Currently known as the "Darley Test Stakes" after Darley began sponsoring the race in 2006, it is run at a distance of seven furlongs on the dirt and is an influential race in shaping the Breeders' Cup Distaff.
Test the Nation Test the Nation is a television programme, first broadcast in 2001 by BNN in the The Netherlands. The format has now been made around the world in countries such as Germany, the United Kingdom, the United States, Indonesia, New Zealand, Denmark, Japan, and Ireland.
Test tube A test tube, also known as a culture tube, is a piece of laboratory glassware composed of a finger-like length of glass tubing, open at the top, with a rounded U-shaped bottom. Often, the top features a flared lip.
Test Track Test Track is an attraction at Epcot at Walt Disney World Resort in Lake Buena Vista, Florida. It is sponsored by General Motors "General Motors and the Walt Disney Company sign a new contract that ensures GM's presence at the Walt Disney World Resort in Florida until the 21st century.
Test Valley Arts Foundation Test Valley Arts Foundation (TVAF) is an independent grant giving charity established in 1991 by the late Michael Colvin MP with generous help from TESCO and Test Valley Borough Council. Since its inception TVAF has distributed some ÂŁ75,000 in grants, awards, bursaries and underwriting to individual artists and arts organisations throughout the Test Valley.
Test Your Might Test Your Might is a minigame that first appeared in the arcade game Mortal Kombat as an interlude between battles. The minigame would consist of your character standing above one of five blocks of increasing hardness, depending on how far you have progressed in Test Your Might.
Test-and-set In computer science, the test-and-set instruction is an instruction used to atomically write to a memory location. This means setting a value, but first performing some test (such as, the value is equal to another given value).
Test-driven development Test-driven development (TDD) is a software development technique that involves repeatedly first writing a test case and then implementing only the code necessary to pass the test. Test-driven development gives rapid feedback.
Testability Testability, a property applying to an empirical hypothesis, involves two components: (1) the logical property that is variously described as contingency, defeasibility, or falsifiability, which means that counterexamples to the hypothesis are logically possible, and (2) the practical feasibility of observing a reproducible series of such counterexamples if they do exist. In short, a hypothesis is testable if there is some real hope of deciding whether it is true or false of real experience.
Testament (comics) Testament is a comic book written by Douglas Rushkoff with art and cover by Liam Sharp, first published in December 2005. It tells two stories, drawing comparison between the Bible's texts and related untold history, and a near future in which grad student Jake Stern and his conscientious objector friends fight a new RFID-based universal draft by attempting to access the collective unconscious through an experimental shared experience sensory deprivation tank.
Testament (film) Testament is a 1983 film directed by Lynne Littman and starring Jane Alexander. Other actors include William Devane, Rossie Harris, Roxana Zal, Lukas Haas, Philip Anglim, Lilia Skala, Leon Ames, Kevin Costner, and Rebecca De Mornay.
Testament (Xenosaga) In the PlayStation 2 role-playing game trilogy Xenosaga, the Testaments are Wilhelm's closest assistants and servants. Characterized by colored robes with matching beaklike masks, the true nature and power of the Testaments is unknown. It is hinted that they possess the power to manipulate space, and they seem to be able to appear and disappear at will. Also, each Testament has their own E.S., a special kind of spacecraft that contains a Vessel of Anima. Four Testaments exist by the end of Episode II: red, blue, black, and white.
Testament of Abraham The Testament of Abraham is a 1st century CE Jewish work originating in EgyptTestament of Abraham now regarded as part of the Old Testament apocrypha. It is often treated as one of a trio of very similar works, the other two of which are the Testament of Isaac and Testament of Jacob, though there is no reason to assume that they were originally a single work.
Testament of Adam The Testament of Adam is a Christian pseudepigraphical work extant in Syriac and Arabic. The earliest manuscript is dated to the 6th century, but the text is 4th century CE in origin, probably composed in Edessa.
Testament of Isaac The Testament of Isaac is a work now regarded as part of the Old Testament apocrypha. It is often treated as one of a trio of very similar works, the other two of which are the Testament of Abraham and Testament of Jacob, though there is no reason to assume that they were originally a single work.
Testament of Jacob The Testament of Jacob is a work now regarded as part of the Old Testament apocrypha. It is often treated as one of a trio of very similar works, the other two of which are the Testament of Abraham and Testament of Isaac, though there is no reason to assume that they were originally a single work.
Testament of Job The Testament of Job is a book written in the 1st century BCE or the 1st century CE (thus part of a tradition often called "intertestamental literature" by Christian scholars). The earliest surviving manuscript is in Coptic, of the 5th century; other early surviving manuscripts are in Greek and Old Slavonic.
Testament of Pope John Paul II The Testament of Pope John Paul II is a document sealed with the Ring of the Fisherman of Pope John Paul II, and is similar to a civilian last will and testament. It was modeled on the Testament of Pope Paul VI.
Testament of Pope Paul VI The Testament of Pope Paul VI is a document sealed with the Ring of the Fisherman of Pope Paul VI, similar to a civilian last will and testament. It was modeled after the papal testaments of Pope Paul VI's predecessors.
Testament of Solomon The "Testament of Solomon" is an Old Testament pseudepigraphical work, purportedly written by King Solomon, in which Solomon mostly describes particular demons whom he enslaved to help build the temple, the questions he put to them about their deeds and how they could be thwarted, and their answers, which provide a kind of self-help manual against demonic activity. The author is obviously a Christian.
Testament Records Testament Records was a Philadelphia, later Chicago, then Pasadena based independent record label founded in 1963 by Down Beat magazine editor and writer Pete Welding specializing in American roots music, releasing some thirty mainly blues, but also gospel, country and jazz albums until 1977.
Testamentary trust A testamentary trust (sometimes referred to as a will trust) is trust which arises upon the death of the testator, usually under his will. Testamentary trusts are distinguished from inter vivos trusts, which are created during the settlor's lifetime.
Testaments of the Twelve Patriarchs The Testaments of the Twelve Patriarchs is an important constituent of the apocryphal scriptures connected with the Old Testament, comprising the dying commands of the twelve sons of Jacob. It is part of the Oskan Armenian Orthodox Bible of 1666 and fragments were found at Qumran.
Testatika The Testatika is an electromagnetic generator based on the 1898 Pidgeon electrostatic machine which includes an inductance circuit, a capacitance circuit, and a thermionic rectification valve. Allegedly a perpetual motion machine, the Testatika resembles in some respects a Wimshurst machine.
Testator A testator is a person who has made a legally binding will or testament, which specifies what is to be done with that person's family and/or property after death. A female testator is sometimes referred to as a testatrix, particularly in older cases.
Testbed A testbed is a platform for experimentation for large development projects. Testbeds allow for rigorous, transparent and replicable testing of scientific theories, computational tools, and other new technologies.
TestDisk TestDisk is a powerful free software data recovery utility licensed under GNU GPL. It was primarily designed to help recover lost data storage partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software, certain types of viruses or human error (such as accidentally erasing your partition table).
Testeagles The Testeagles are a three-piece rock band formed in Adelaide, South Australia in 1994. The band is made up of the brothers, Matty (guitar/vocals) & Ady Matt (drums) alongside D (bass/vocals), who replaced their original bass player Dean, who left the band after their van caught on fire & exploded after a fuel leak while on tour.
Testerian Testerian is a pictorial writing system that was used until the 19th century to teach Christian doctrine to Indians in Mexico, who were unfamiliar with alphabetic writing systems. Its invention is attributed to Jacobo de Testera, a Franciscan who arrived in Mexico in 1529.
Testicle cuff A testicle cuff is a ring-shaped device around the scrotum between the body and the testicles such that when closed it does not allow the testicles to pass through it. A common type has two connected cuffs; one for the scrotum and one for the base of the penis.
Testicular atrophy Testicular atrophy is a medical condition in which the male reproductive organs (the testes, which in humans are located in the scrotum) diminish in size and may be accompanied by ceasing to function. This is not used to refer to temporary changes such as those brought on by cold.
Testicular Akathisia Testicular akathisia (commonly referred to as "jimmy nuts" or "whack sack") is a specific subtype of acute akathisia that is localized to the testes and/or scrotum of male sufferers. Akathisia, a psychoneourological movement disorder, is characterized by a subjective and distressing feeling of inner restlessness resulting in an inability to remain still and varying degrees of psychomotor agitation such as fidgeting, rocking, pacing, shifting positions, crossing and uncrossing of the legs, etc.
Testicular nubbin The residual tissue of the human testis after a supposed perinatal vascular accident involving the testicular blood supply. The blood supply of the testis twists (called torsion) thereby cutting off the blood supply to the testis and results in testicular atrophy (shrinking).
Testicular sperm extraction Testicular Sperm Extraction (TESE) is the process of removing a small portion of tissue from the testicle under local anesthesia to extracting the few viable sperm cells present in that tissue for the purpose of Intracytoplasmic sperm injection (ICSI). The Testicular Sperm Extraction process is recommended to men who are unable to produce sperm by ejaculation as a result of primary testicular failure, congenital absence of the vas deferens or non-reconstructed vasectomy.
Testify (band) German band Testify began in 1993 as an industrial metal side-project to the EBM band The Fair Sex, featuring founding members Rascal Nikov and Myk Jung. During the second half of the nineties, Testify became Myk and Rascal's main act, but it took a back seat when TFS returned in 2002.
Testilying Testilying is police slang for the practice of giving false testimony against a defendant in a criminal trial, typically for the purpose of "making a stronger case" against someone they believe to be guilty, although it may also be for the purpose of framing an innocent defendant.
Testimonial In promotion and advertising, a testimonial or endorsement consists of a written or spoken statement, sometimes from a public figure, sometimes from a private citizen, extolling the virtue of some product. The term "testimonial" most commonly applies to the sales-pitches attributed to ordinary citizens, whereas "endorsement" usually applies to pitches by celebrities.
Testimonial match A testimonial match or testimonial game, often referred to simply as a testimonial, is a practice in some sports, notably football (soccer) and especially in the United Kingdom, where a club puts on a match in honour of a player for service to the club.
Testimony of Equality The Testimony of Equality is the Quaker belief that all people are created equal in the eyes of God. This Testimony has prompted Quakers to participate in actions that promote the equality of the sexes and the races, as well as other classifications of people.
Testimony of Integrity The Testimony of Integrity is the Quaker (also known as Friends) belief that one should live a life that is true to God, true to oneself, and true to others. Integrity is commonly associated with honesty and fair dealings, which are key components of it, but to Friends integrity has more to do with personal wholeness and consistency than with these common associations.
Testimony of Simplicity The Testimony of Simplicity is the Quaker belief that a person ought to live his or her life simply in order to focus on what is most important and ignore or play down what is least important. It is the practice among Quakers (members of the Religious Society of Friends) of being more concerned with one’s inner condition than one’s outward appearance and with other people more than oneself.
Testimony of the Evangelist 'Testimony of the Evangelist Examined by the Rules of Evidence Administered in Courts of Justice' or simply Testimony of the Evangelist is an 1846 Christian apologetic work by Simon Greenleaf, a principal founder of the Harvard Law School. His "A Treatise on the Law of Evidence (15 vols.
Testing earth fault resistance The human body conducts electricity, especially where moisture is present, such as in kitchens and bathrooms, and for that reason it is very important that any parts of electricity-using appliances have a high resistance/impedance to the outside case, and/or to any other parts that could get to be in contact with any person's skin. Insulation is provided, and its resistance should be no less than a given high value (see below), so that any current into, or out of, a user's skin is much lower than would cause any harm.
Testing Recall About Strange Happenings Testing Recall About Strange Happenings (TRASH) is a quizbowl format, similar to College Bowl or NAQT, played in the United States and Canada. Teams of up to four players meet at tournaments to compete against each other, answering questions about pop culture and sports.
TestLink TestLink is a web based Software testing and execution tracking system built to improve quality of your verification or testing process. The tool includes reporting and requirements tracking and cooperate with well-known bug tracking systems.
Testosterone poisoning Testosterone poisoning is a neologism that refers not to actual poisoning, but to stereotypical aspects of male behavior. This speculative and controversial expression is based on the belief that an excess of the androgen testosterone creates aggressiveness.
Testosterone spray Testosterone spray, also known as Sex in a Can, developed by the company Acrux, is a transdermal topical spray containing the sex hormone testosterone, intended to improve the libidos of women when applied to the abdomen. As of February, 2005, the spray has been tested in a clinical trial to determine its efficacy.
Tests of general relativity Tests of Einstein's general theory of relativity did not provide an experimental foundation for the theory until well after it was introduced in 1915. Physicists accepted the theory because it correctly accounted for the precession of the perihelion of Mercury, a phenomenon which had long baffled astronomers and physicists, and because it unified Newton's law of universal gravitation with special relativity in a conceptually simple way.
TestYourVoIP TestYourVoIP is a free web service run by Brix Networks that allows you to test your internet connection to see how well it will perform when used for VoIP calls. The tests are performed using Java to allow easy testing with little local setup.
Tet 1969 Tet 1969 refers to the attacks mounted by principally North Vietnamese forces in February 1969 in South Vietnam during the Vietnam War. Most attacks centered around military targets near Saigon and Da Nang and were quickly beaten off, although the U.
Tet Corporation In the Dark Tower series of novels by Stephen King, the Tet Corporation was founded by Roland Deschain and his ka-tet to prevent the destruction of The Rose (in the Dark Tower series) by stopping the Sombra Corporation from purchasing the vacant lot on which the rose grew.
Tet Offensive The Tet Offensive (January 30, 1968 - June 8, 1968) was a series of operational offensives by the Viet Cong and the North Vietnamese Army during the Vietnam War. The operations are called the Tet Offensive as they were timed to begin on the night of January 30–31, 1968, Tết Nguyên Đán (the lunar new year day).
Tet Truce The Tết Truce was a truce that occurred in 1968 between North Vietnam and South Vietnam. The truce was made so that Vietnam could observe the New Year called Tết Nguyên Ðán or Tết Mậu Thân (year of the monkey).
Tetanospasmin Tetanospasmin is the neurotoxin produced by the vegetative spore of Clostridium tetani in anaerobic conditions, causing tetanus. It is sometimes called spasmogenic toxin, tetanus toxin or abbreviated to TeTx or TeNT.
Tetbury Tetbury is a town and civil parish located in Cotswold (district), Gloucestershire, England. It lies on the site of an ancient hill fort, on which an Anglo-Saxon monastery was founded, probably by Ine of Wessex, in 681.
Tetete people The Tetete were an indigenous ethnic group in the Ecuadorian Amazon or Oriente. Their homeland was to the north and west of the Siona people and the Secoya people, whose language is closely related to their Tetete language.
Teteven Glacier Teteven Glacier (Lednik Teteven 'led-nik 'te-te-ven) is a glacier on Greenwich Island, Antarctica draining the N slopes of Dryanovo Heights into the Drake Passage between Crutch Peaks and the ice-free area at AgĂĽedo Point. it extends 7 km in E-W direction, and 3.
Tether (cell biology) Biological cells which form bonds with a substrate and are at the same time subject to a flow can form long thin membrane cylinders called tethers, which connect the adherent area to the main body of the cell. Under physiological conditions, neutrophil tethers can extend to several micrometers.
Tethered spinal cord syndrome Tethered Spinal Cord Syndrome or Occult Spinal Dysraphism Sequence is a neurological disorder caused by tissue attachments that limit the movement of the spinal cord within the spinal column. These attachments cause an abnormal stretching of the spinal cord.
Tetherless computing Tetherless computing is a style of computing where smart mobile devices, such as cell phones and PDAs communicate opportunistically with centralized servers over heterogeneously administered wireless networks [http://blizzard.cs.
Tethyan Trench The Tethyan Trench was an ancient oceanic trench that existed in the northern part of the Tethys Ocean during the Jurassic era. The Tethyan Trench formed when the northern moving Cimmerian Plate was subducting under Laurasia.
Tethyr Tethyr is one of the Empires of the Sand in the fictional Forgotten Realms campaign setting of the Dungeons and Dragons role-playing game. The country is modeled after al-Andalus (Moorish Spain) with some tiny slices of Roman Britain.
Tetchie Agbayani Tetchie Agbayani (real name Visitacion Parado) is a Filipina actress who has appeared in a number of international productions as well as many in her own country (sometimes credited as Carol Roberts). She gave up her studies for show business after becoming runner up in the Mutya ng Pilipinas beauty contest in 1979.
Tetisheri Tetisheri was the matriarch of the Egyptian royal family of the late 17th Dynasty and early 18th Dynasty. She was the wife of Tao I Seqenenre, the mother of Tao II Seqenenre, and the grandmother of Kamose and Ahmose I.
Tetley Tetley, a fully-owned subsidiary of Tata Tea Limited, is the world's second largest manufacturer and distributor of tea. Owned by India's Tata Group, Tetley's manufacturing and distribution business is spread across 40 countries and sells over 60 branded tea bags.
Teton Dam The Teton Dam was a federally built dam on the Teton River in southeastern Idaho in the United States which suffered a spectacular failure on June 5, 1976. The collapse of the dam resulted in the loss of 14 lives.
Teton Pass Ski Area Teton Pass Ski Area is an alpine ski area located along the Rocky Mountain Front in central Montana, just west of Choteau, Montana. The area is mostly used as a local ski hill and is commonly open only on weekends.
Teton Range The Teton Range is a small but dramatic mountain range of the Rocky Mountains in North America. A north-south range, it is on the Wyoming side of the state's border with Idaho, just south of Yellowstone National Park.
Teton River (Idaho) The Teton River is a tributary of Henrys Fork of the Snake River, approximately 60 mi (97 km) long, in southeastern Idaho in the United States. It drains an isolated valley along the west side of the Teton Range along the Idaho-Wyoming border at the eastern end of the Snake River Plain.
Teton River (Montana) The Teton River (pronounced "TEE-tuhn") is a tributary of the Marias River, approximately 150 mi (241 km) long, in northwestern Montana in the United States. It rises in the Lewis and Clark National Forest, in the southern Lewis Range of the Rocky Mountains at the continental divide.
Tetraborane Tetraborane, or to be more precise tetraborane(10) or arachno-B4H10, is a foul-smelling toxic gas. The structure of tetraborane is based around a tetrahedral arrangement of boron atoms, and can be derived from PSEPT.
Tetrabromomethane Tetrabromomethane, CBr4, also known as carbon tetrabromide, is a carbon bromide. Both names are acceptable under IUPAC nomenclature, depending on whether it is considered as an inorganic or an organic compound.
Tetrabutylammonium hydroxide Tetrabutyl ammonium hydroxide is the chemical compound with the formula (C4H9)4NOH, abbreviated Bu4NOH with the acronymn TBAH. This species is not readily obtainable as a pure compound, but it employed as a solution in water or alcohols.
Tetracameralism Tetracameralism (tetra + Latin camera, chamber) is the practice of having four legislative or parliamentary chambers. It is contrasted to unicameralism and bicameralism, which are far more common, and tricameralism, which is rarely used in government.
Tetracapsuloides bryosalmonae Tetracapsuloides bryosalmonae is a myxozoan parasite of salmonid fishes, which causes Proliferative kidney disease (PKD), one of the most serious parasitic diseases of salmonid populations in Europe and North America, which causes losses of up to 90% in infected populations.
Tetracentron Tetracentron sinense is a flowering plant, the sole species in the genus Tetracentron. It is also often considered the sole species in the family Tetracentraceae, though some botanists include it in the family Trochodendraceae together with the very distinct genus Trochodendron.

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