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Triangulum
Triangulum is a small constellation of the northern sky, one of the 48 listed by Ptolemy, best known as the home of the Triangulum Galaxy, Messier 33.
Triangulum Galaxy
The Triangulum Galaxy, also known as Messier 33 or M33, is a spiral galaxy about 2.73 million light-years from Earth and the third-largest member of the Local Group.
Trianon
Trianon (board game) is a 1992 abstract strategy game by Hans van Maanen, played on a 5x5 board where players drop stones and lose by having 3 of their own stones on an orthogonal or diagonal line; Ludii identifier DLP.Games.1520.
Triantafyllos Chavakis
Triantafyllos Chavakis is a Greek-born German clinician-scientist and immunologist at TU Dresden who showed that trained innate immunity is initiated in bone marrow stem cells.
Triapenthenol
Triapenthenol (CAS 76608-88-3, EU ID 155, trade name Baronet) is a triazole plant growth regulator and gibberellin biosynthesis inhibitor used on oilseed rape; not approved in the EU, default MRL 0.01 mg/kg.
Triarchic theory of intelligence
Sternberg's triarchic theory of intelligence (1985) holds that intelligence comprises componential, experiential, and contextual subtheories, expressed as analytical, creative, and practical abilities, measured by the STAT and debated against g-factor psychometrics.
Triarylboranes
Triarylboranes are organoboron compounds of formula BAr3, in which three aryl groups bond to tricoordinate boron, making strong Lewis acids used in catalysis, sensors, OLEDs, and bio-imaging; tris(pentafluorophenyl)borane is the prominent member.
Triassic
The Triassic, the first period of the Mesozoic Era, ran from about 252 to 201 million years ago, saw the first dinosaurs, and opened after Earth's largest mass extinction.
Triassic amphibians
Triassic amphibians were dominated worldwide by large aquatic temnospondyl predators that recovered after the end-Permian extinction, while the earliest undisputed frogs appeared in the Early Triassic.
Triassic–Jurassic extinction
The Triassic–Jurassic extinction, also called the end-Triassic extinction, was a mass extinction about 201 million years ago, likely caused by massive CAMP volcanic eruptions as Pangea broke apart.
Triassic–Jurassic fern spore abnormalities
Triassic–Jurassic fern spore abnormalities are malformed fossil spores, up to 70% in some samples, marking environmental stress at the end-Triassic extinction about 201.6 million years ago.
Triasulfuron
Triasulfuron (CASRN 82097-50-5, C14H16ClN5O5S) is a sulfonylurea ALS-inhibiting herbicide for broadleaf and grassy weeds in wheat, barley, fallow, and rangeland; sold since 1987, water dispersible granules, persistent in alkaline soils with crop rotation restrictions.
Triathlon
Triathlon: swim, bike, run race in succession. First held San Diego 1974; Ironman from 1978; Olympic sport since Sydney 2000 at 1,500 m/40 km/10 km; governed by World Triathlon.
Triatominae
Triatominae, kissing bugs or triatomine bugs, are blood-feeding assassin bugs (Reduviidae) that transmit Trypanosoma cruzi, the agent of Chagas disease; 157 species in 18 genera and five tribes, mostly in the Americas.
Triaxial shear test
The triaxial shear test, or triaxial compression test, is a laboratory test measuring the shear strength of a soil specimen under confining pressure, used in foundation design.
Triazbutyl
Triazbutyl (4-n-butyl-1,2,4-triazole, RH-124, CAS 16227-10-4) is a systemic fungicide developed by Rohm and Haas for wheat leaf rust control by seed, foliar, and soil application; not EU-approved since 2002.
Triazolam
Triazolam (Halcion) is a short-acting benzodiazepine hypnotic for sleep onset insomnia, half-life 2-3 hours, 0.125-0.25 mg tablets, boxed warning, CYP3A4 interactions, withdrawn in UK and France.
Triazophos
Triazophos (CAS 24017-47-8), an organophosphorus insecticide, acaricide, and nematicide acting as an acetylcholinesterase inhibitor; WHO class Ib, banned in India and not approved in the EU or US.
Triazoxide
Triazoxide: ISO name for 7-chloro-3-imidazol-1-yl-1,2,4-benzotriazine 1-oxide, a contact, non-systemic imidazole (benzotriazine) fungicide used as a cereal seed treatment at 2-4 g AI/100 kg seed; EU-approved 2011, expired 2021.
TRIB3
TRIB3 (tribbles homolog 3, TRB3) is a mammalian pseudokinase gene encoding a 45-kDa stress-induced scaffold protein that binds Akt, ATF4/CHOP, and COP1, linking insulin resistance, diabetes, and cancer progression.
Tribadism
Tribadism, also called tribbing or scissoring, is genital rubbing between women, especially vulva-to-vulva contact. From Greek tribein "to rub"; historically named the clitoris-linked "tribade" figure before narrowing to the act itself.
Tribal chief
Tribal chief: leader of a tribal or customary community, holding inherited or elected authority. Also called traditional leader or customary chief; in US tribal governments the chief executive is usually an elected chairman, president, or principal chief.
Tribal Commissioner-in-Chief Offices
Tribal Commissioner-in-Chief Offices (部族节度使司) were Liao and later Jin dynasty offices that placed a tribal commissioner-in-chief at the head of a tribe, with military and civil authority over it.
Tribal food distribution and food sovereignty programs in the United States
Tribal food distribution and food sovereignty programs in the United States center on FDPIR, a federal program delivering monthly USDA food packages to income-eligible Native American households on or near reservations.
Tribal Seeds
Tribal Seeds are an American roots reggae band from San Diego, California, formed in 2005 by the brothers Steven and Tony-Ray Jacobo; their album Representing topped the Billboard Reggae chart in 2014.
Tribal sovereignty in the United States
Tribal sovereignty in the United States is the inherent authority of 574 federally recognized tribes to govern themselves. This authority predates the Constitution and is exercised over tribal lands.
Tribal-class destroyer (1936)
The Tribal-class destroyer, also known as the Afridi class, was a class of large, heavily gun-armed fleet destroyers built for the Royal Navy from 1937.
Tribalism
Tribalism: strong loyalty to one's own tribe or social group, also the tendency to treat one's group as "us" and others as "them". Studied via social identity theory; scholars since Vail (1989) and Mafeje treat tribalism as partly a colonial construct, and "tribe" is discredited in anthropology.
Tribanadhari Barbarik
Tribanadhari Barbarik (త్రిబాణధారి బర్బరీక్) is a 2025 Telugu suspense thriller directed by Mohan Srivatsa, starring Sathyaraj as a psychiatrist searching for his missing granddaughter, reimagining the mythological Barbarik; released 29 August 2025, flopped theatrically, streamed on Sun NXT and Prime Video.
Tribble
Tribbles are fictional small, furry, purring Star Trek aliens created by David Gerrold for the 1967 episode "The Trouble with Tribbles" (originally named "fuzzies"), famous for rapid reproduction, recurring in Deep Space Nine's "Trials and Tribble-ations".