Edgepedia

Tricalcium silicate

Tricalcium silicate (Ca3SiO5, C3S) is a calcium silicate whose impure clinker form is called alite; it is the main constituent of Portland cement, controlling setting and hardening.

Oct 22, 2026

Tricameral Parliament

The Tricameral Parliament was apartheid South Africa's three-chamber legislature, created by the 1983 Constitution Act and excluding Black Africans entirely; it was disbanded in 1993.

Trican Well Service

Trican Well Service is a Calgary, Alberta based oilfield services company and Canada's largest pressure pumping provider, offering hydraulic fracturing, cementing, and coiled tubing services.

Tricaprilin (AC-1202, CER-0001, glyceryl tricaprylate) is an 8-carbon medium-chain triglyceride ketogenic agent studied for mild to moderate Alzheimer's disease, marketed as Axona, with benefit mainly in APOE4-negative patients.

Tricare

TRICARE is the uniformed services health care program of the U.S. Department of Defense, administered by the Defense Health Agency, covering over 9 million active duty members, families, Guard and Reserve members, retirees, and survivors through plans such as Prime, Select, and TRICARE For Life.

Tricastin (Orano plant)

Tricastin is Orano's nuclear fuel-cycle site on the Drôme–Vaucluse border near Pierrelatte, France, home to the Philippe Coste conversion and Georges Besse II enrichment plants.

Tricastin nuclear power plant

The Tricastin nuclear power plant is a French nuclear power station at Saint-Paul-Trois-Châteaux in the Drôme, operated by EDF with four 915 MWe reactors that entered service in 1980 and 1981.

Trice Medical

Trice Medical, originally InSyte Medical Technologies, is an American device company specializing in minimally invasive orthopedic instruments like the mi-eye arthroscope and the Tenex system.

Oct 20, 2026

Tricensimum

Tricensimum (Ad Tricensimum), Latin for 'at the thirtieth milestone,' names two Roman road stations: a mansio 30 miles from Aquileia (modern Tricesimo, Italy) and a mutatio on the Via Aquitania near Trèbes, France; related Tricensima fortress at Xanten.

Triceps

Triceps brachii, the three-headed extensor muscle of the posterior arm supplied by the radial nerve with frequent axillary and ulnar variations; its distal tendon ruptures are rare, mostly in male weightlifters, repaired surgically with good outcomes.

Tricept

The Tricept is a parallel kinematic robot and machine tool invented by Karl-Erik Neumann in Sweden, patented in 1985 and reaching industrial use in aerospace machining.

Triceratops

Triceratops, a 9 m, 10-ton horned ceratopsian dinosaur from Late Cretaceous North America (68–66 mya), named by Marsh in 1889 after a bison misidentification; two species, T. horridus and T. prorsus, evolved anagenetically.

Trichechus inunguis

Trichechus inunguis, the Amazonian manatee (peixe-boi-da-Amazônia), is the only exclusively freshwater sirenian, endemic to the Amazon Basin, the smallest manatee species, and IUCN Vulnerable after centuries of hunting.

Oct 20, 2026

Trichiasis without entropion

Trichiasis without entropion (ICD-11 9A04.0) is misdirected eyelashes touching the cornea or conjunctiva with a normal lid margin position. Causes include blepharitis, trachoma, and burns; treated by epilation, electrolysis, laser, or surgery.

Trichilemmal cyst

A trichilemmal cyst, also called a pilar cyst, is a keratin-filled cyst of the hair follicle's outer root sheath, occurring mostly on the scalp in middle-aged women.

Trichinella spiralis

Trichinella spiralis, the pork and wildlife roundworm discovered in 1835 by James Paget and named by Richard Owen, causes trichinellosis; once the genus's sole species, it now heads a genus of 13 taxa.

Trichinosis

Trichinosis (trichinellosis), caused by Trichinella roundworms, is acquired by eating raw or undercooked meat, now mostly wild game such as bear; symptoms include fever, myalgia, periorbital edema, and eosinophilia, treated with albendazole or mebendazole.

Trichites

Trichites: rod-shaped extrusomes of Strombidium ciliates; also a fossil Pinnoidea bivalve genus (Voltz in Thurmann, 1832/1833) from Mesozoic marine rocks, and an invalid bird genus name (Heine, 1860), a junior homonym replaced by Calyptocichla.

Oct 20, 2026

Trichiurus lepturus

Trichiurus lepturus, the largehead hairtail or Atlantic cutlassfish, is a ribbon-like cutlassfish (Trichiuridae) of tropical and temperate seas, among the world's top ten landed fish; overfished in the East China Sea, Least Concern globally.

Trichlorfon

Trichlorfon, also known as metrifonate, Dylox, Dipterex, or Neguvon, is an organophosphate insecticide and cholinesterase inhibitor, introduced commercially in 1952, used against flies, cockroaches, and other pests.

Trichlormethiazide

Trichlormethiazide (Naqua, Metahydrin) is an oral thiazide diuretic similar to hydrochlorothiazide, C8H8Cl3N3O4S2, ATC C03AA06, dosed 2–4 mg daily for edema and hypertension; first approved 1960, discontinued in the US.

Trichloroacetic acid

Trichloroacetic acid (TCA), also called trichloroethanoic acid, is the chlorinated acetic acid CCl3COOH, used in skin peels and protein precipitation and formed in chlorinated drinking water.

Trichloroethylene

Trichloroethylene (TCE) is a volatile chlorinated solvent used mainly in metal degreasing and refrigerant manufacture, classified as a human carcinogen and banned by the EPA in 2024.

Trichlorofluoromethane

Trichlorofluoromethane (CCl₃F), known as CFC-11 or Freon 11, is a chlorofluorocarbon used as a foam-blowing agent and refrigerant until banned under the Montreal Protocol, with a 52-year atmospheric lifetime.

Trichloronat

Trichloronat (trichloronate, CAS 327-98-0) is a persistent organothiophosphorus soil insecticide for vegetable fly larvae; no ADI was set in 1971, and it is not approved in the EU or marketed in the US or Canada.

Trichlorosilane

Trichlorosilane (SiHCl₃), also called silicochloroform, is a colorless, fuming, highly flammable liquid chlorosilane. It is the central intermediate in producing high-purity polysilicon for semiconductors and solar cells.

Tricho-dento-osseous syndrome

Tricho-dento-osseous syndrome (TDO, TDO syndrome, OMIM 190320) is a rare autosomal dominant DLX3-related ectodermal dysplasia causing curly hair at birth, enamel hypoplasia, taurodontism, and increased bone density.

Trichobezoar

Trichobezoar: a hairball (bezoar) of swallowed hair in the stomach, from trichotillomania and trichophagia; ~90% female, ages 10-19; Rapunzel syndrome when it extends into small bowel; usually surgical removal.

Trichobilharzia regenti

Trichobilharzia regenti, the bird nasal schistosome, is a neurotropic avian blood fluke described in 1998 in Czechia; its larvae migrate through duck spinal cord and brain to the nasal mucosa and cause swimmer's itch in humans.