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Medical Dictionary


trichotillomania (trik′o-til-o-ma′ne-a)
A compulsion to pull out one's own hair. [tricho- + G. tillo, pull out, + mania, insanity]

trichotomy (tri-kot′o-me)
A division into three parts. [G. trichia, threefold, + tome, a cutting]

trichotoxin (trik′o-tok′sin)
A cytotoxin having an injurious effect specifically for ciliated epithelium.

trichotrophy (tri-kot′ro-fe)
Nutrition of the hair. [tricho- + G. trophe, nourishment]

trichroic (tri-kro′ik)
Relating to or marked by trichroism.

trichroism (tri′kro-izm)
The property of some crystals of emitting different colors in three different directions. [G. trichroos, three-colored, fr. tri- + chroa, color]

trichromat (tri-kro′mat)
A person who sees three primary colors; hence, one with normal color vision. [tri- + G. chroma, color]

trichromatic (tri-kro-mat′ik)
1. Having, or relating to, the three primary colors: red, green, and blue. 2. Capable of perceiving the three primary colors; having normal color vision. SYN: trichromic.

trichromatism (tri-kro′ma-tizm)
The state of being trichromatic. [tri- + G. chroma, color] anomalous t. a defect in color perception in which there appears to be an abnormality or deficiency in one of the three primary pigments of the retinal cones. See protanomaly, deuteranomaly, tritanomaly.

trichromatopsia (tri-kro′ma-top′se-a)
Normal color vision; the ability to perceive the three primary colors. [tri- + G. chroma, color, + opsis, vision]

trichromic (tri-kro′mik)
SYN: trichromatic.

trichterbrust (tricht′er-broost)
SYN: pectus excavatum. [Ger. T., funnel chest]

trichuriasis (tri-koo-ri′a-sis)
Infection with nematodes of the genus Trichuris. In humans, intestinal parasitization by T. trichiura is usually asymptomatic and not associated with peripheral eosinophilia; in massive infections it frequently induces diarrhea or rectal prolapse.

Trichuris (tri-koo′ris)
A genus of aphasmid nematodes (sometimes improperly termed Trichocephalus) related to the trichina worm, Trichinella spiralis, and having a body with a slender, elongated, anterior portion threaded into the mucosa of the colon or large intestine of the host and a thick posterior portion bearing reproductive organs and their products. T. contains about 70 species, all in mammals. [tricho- + G. oura, tail] T. suis a nematode species found in the pig; adult worms have been found in humans. T. trichiura the whipworm of humans, a species that causes trichuriasis; the body is filiform and slender in the anterior three-fifths, and more robust posteriorly; females are 4 or 5 cm long, males are shorter (with coiled caudal extremity and a single eversible spicule); eggs are barrel-shaped, 50–56 μm by 20–22 μm, with double shell and translucent knobs at each of the two poles; humans are the only susceptible hosts and usually acquire infection by direct finger-to-mouth contact or by ingestion of soil, water, or food that contains larvated eggs (development in the soil takes 3–6 weeks under proper conditions of warmth and moisture, hence distribution is chiefly tropical); larvae escape from eggs in the ileum, mature in approximately a month, and then pass directly into the cecum without undergoing a parenteral migration as occurs with Ascaris lumbricoides; adults may persist for 2–7 years. T. vulpis a nematode species found in the dog; the sexually mature adult has been found in the human appendix.

tricipital (tri-sip′i-tal)
Having three heads; denoting a triceps muscle.

triclobisonium chloride (tri′klo-bi-so′ne-um)
A bisquaternary ammonium compound used topically in the treatment of superficial infections of the skin and vagina; a cationic antiseptic effective against both Gram-negative and Gram-positive organisms. It is inactivated by soap and pH changes.

triclofenol piperazine (tri-klo′fen-ol)
An anthelmintic.

triclofos (tri′klo-fos)
A phosphorylated derivative of chloral hydrate, which is hydrolyzed to chloral hydrate in the body and produces characteristic sedative-hypnotic properties.

tricorn (tri′korn)
1. One of the lateral ventricles of the brain. 2. SYN: tricornute. [tri- + L. cornu, horn]

tricornute (tri-kor′noot)
Having three cornua or horns. SYN: tricorn (2) . [tri- + L. cornutus, horned, fr. cornu, a horn]

tricresol (tri-kre′sol)
SYN: cresol.

tricrotic (tri-krot′ik)
Thrice-beating; marked by three waves in the arterial pulse tracing. SYN: tricrotous. [tri- + G. krotos, a beat]

tricrotism (tri′kro-tizm)
The condition of being tricrotic.

tricrotous (tri′kro-tus)
SYN: tricrotic.

Tricula (trik′u-la)
A genus of operculate freshwater snails related to Oncomelania (the Schistosoma japonicum intermediate hosts) of the subfamily triculinae, family Hydrobiidae, subclass Prosobranchiata; it includes T. aperta, intermediate host of Schistosoma mekongi.

tricuspid, tricuspidal, tricuspidate (tri-kus′pid, -kus′pi-dal, -kus′pi-dat)
1. Having three points, prongs, or cusps, as the t. valve of the heart. 2. Having three tubercles or cusps, as the second upper molar tooth (occasionally) and the upper third molar (usually). SYN: tritubercular.

tricyclamol chloride (tri-si′kla-mol)
SYN: procyclidine methochloride.

tridactylous (tri-dak′ti-lus)
SYN: tridigitate.

trident (tri′dent)
SYN: tridentate.

tridentate (tri-den′tat)
Three-toothed; three-pronged. SYN: trident. [tri- + L. dentatus, toothed]

tridermic (tri-der′mik)
Relating to or derived from the three primary germ layers of the embryo: ectoderm, endoderm, and mesoderm. [tri- + G. derma, skin]

tridermoma (tri-der-mo′ma)
SYN: triphyllomatous teratoma. [tri- + G. derma, skin, + -oma, tumor]

tridigitate (tri-dij′i-tat)
Having three fingers or three toes on one hand or foot. SYN: tridactylous. [tri- + L. digitus, digit]

tridihexethyl chloride (tri′di-heks-eth′il)
An anticholinergic drug.

tridymite (trid′i-mit)
A form of silica used in dental casting investment. [fr. G. tridymos, threefold]

tridymus (trid′i-mus)
SYN: triplet (1) . [L. fr. G. tridymos, threefold]

trielcon (tri-el′kon)
A long, three-jawed forceps for the extraction of foreign bodies from wounds or canals. [tri- + G. helko, to draw]

trientine hydrochloride (tri′en-ten)
A chelating agent used to remove excess copper from the body in Wilson disease. SYN: triethylenetetramine dihydrochloride.

triethanolamine (tri′eth-a-nol′a-men)
A mixture of mono-, di-, and t., used as an emulsifying agent in the preparation of medicated ointments and lotions and as an aid in the absorption of such medicaments through the skin.

triethylene glycol (tri-eth′i-len)
Used in the vapor state as an air-sterilizing agent; toxic to bacteria, fungi, and viruses in very low concentrations in air; variations in the humidity of the air limit the germicidal effectiveness.

triethylenemelamine (TEM) (tri-eth′i-len-mel′a-men)
An antineoplastic agent chemically related to the nitrogen mustards; used in the treatment of leukemia.

triethylenephosphoramide (TEPA) (tri-eth′i-len-fos-for′a-mid)
A drug with the same actions and uses as triethylenemelamine in the treatment of leukemias.

triethylenetetramine dihydrochloride (tri-eth′i-len-tet′ra-am′en)
SYN: trientine hydrochloride.

triethylenethiophosphoramide (tri-eth′i-len-thi′o-fos-for′a-mid)
An alkylating agent used for the palliative treatment of malignant diseases such as leukemia, lymphoma, and carcinoma. SYN: thiotepa.

trifacial (tri-fa′shal)
Denoting the fifth pair of cranial nerves, the trigeminal nerves. [tri- + L. facies, face]

trifid (tri′fid)
Split into three. [L. trifidus, three-cleft]

trifluoperazine hydrochloride (tri′floo-o-per′a-zen)
An antipsychotic of the phenothiazine type.

trifluoroacetyl (tri-flur′o-as′e-til)
A group used to protect amino moieties of amino acid and peptides during peptide synthesis.

2,2,2-trifluoroethyl vinyl (tri-flor-o-eth′il)
SYN: fluroxene.

5-trifluoromethyldeoxyuridine (tri-flor′o-meth′il-de-ok-si-u′ri-den)
A pyrimidine analog used topically in the treatment of herpes simplex keratitis.

trifluperidol hydrochloride (tri-floo-per′i-dol)
A tranquilizer.

triflupromazine hydrochloride (tri-floo-pro′ma-zen)
An antipsychotic closely related chemically and pharmacologically to chlorpromazine.

trifluridine (tri-floor′i-den)
An antiviral agent used in eye drops to treat herpes simplex infections of the eye.

trifocal (tri′fo-kal)
Having three foci. See t. lens.

trifurcation (tri-fur-ka′shun)
1. A division into three branches. 2. The area where the tooth roots divide into three distinct portions. [tri- + L. furca, fork]

trigastric (tri-gas′trik)
Having three bellies; denoting a muscle with two tendinous interruptions. [tri- + G. gaster, belly]

trigeminal (tri-jem′i-nal)
Relating to the fifth cranial or trigeminus nerve. SYN: trigeminus. [L. trigeminus, threefold]

trigeminus (tri-jem′i-nus)
SYN: trigeminal. [L. threefold, fr. tri- + geminus, twin]

trigeminy (tri-jem′i-ne)
SYN: trigeminal rhythm. [L. trigeminus, threefold]

trigenolline (trig-e-nol′en)
SYN: trigonelline.

trigger (trig′er)
Term describing a system in which a relatively small input turns on a relatively large output, the magnitude of which is unrelated to the magnitude of the input. ECG t. use of the electrocardiogram, usually the R wave, to control electronically some recording or imaging apparatus. See cardiac gating. SYN: EKG t.. EKG t. SYN: ECG t..

triglyceride (tri-glis′er-id)
SYN: triacylglycerol.

trigona (tri-go′na)
Plural of trigonum. [L.]

trigonal (trig′o-nal)
Triangular; relating to a trigonum.

trigone (tri′gon) [TA]
1. SYN: trigonum. 2. The first three dominant cusps (protocone, paracone, and metacone), taken collectively, of an upper molar tooth. [L. trigonum, fr. G. trigonon, triangle] t. of auditory nerve the slight prominence of the floor of the lateral recess of the fourth ventricle, corresponding to the underlying cochlear and vestibular nuclei. SYN: acoustic tubercle, trigonum nervi acustici. t. of bladder [TA] a triangular smooth area at the base of the bladder between the openings of the two ureters and that of the urethra. SYN: trigonum vesicae [TA] , Lieutaud body, Lieutaud triangle, Lieutaud t., vesical triangle. cerebral t. SYN: fornix. collateral t. [TA] a triangular prominence of the floor of the lateral ventricle at the transition between occipital and temporal horn, continuous rostrally with the collateral eminence and, like the latter, caused by the deep penetration of the collateral sulcus from the ventral surface of the temporal lobe. SYN: trigonum collaterale [TA] , t. of lateral ventricle, trigonum ventriculi, ventricular t.. deltoideopectoral t. SYN: infraclavicular fossa. fibrous trigones of heart right fibrous t. (of heart), left fibrous t. (of heart). t. of fillet SYN: t. of lateral lemniscus. t. of habenula SYN: habenular t.. habenular t. [TA] a small triangular area on the dorsomedial surface of the thalamus at the caudal end of the medullary stria, corresponding to the underlying habenula. SYN: trigonum habenulae [TA] , t. of habenula. hypoglossal t. [TA] a slight elevation in the floor of the inferior recess of the fourth ventricle, beneath which is the nucleus of origin of the twelfth cranial nerve. SYN: trigonum nervi hypoglossi [TA] , t. of hypoglossal nerve&star, eminentia hypoglossi, hypoglossal eminence, trigonum hypoglossi, tuberculum hypoglossi. t. of hypoglossal nerve hypoglossal t.. inguinal t. SYN: inguinal triangle. t. of lateral lemniscus [TA] a triangular area on the lateral surface of the caudal half of the mesencephalon, bordered caudally by the slight prominence of the lateral lemniscus, dorsally by the base of the inferior colliculus and the brachium of the superior colliculus, and ventrally by the crus cerebri. SYN: lemniscal t., Reil triangle, triangle of fillet, t. of fillet. t. of lateral ventricle SYN: collateral t.. left fibrous t. (of heart) the part of the fibrous skeleton of the heart located in the interval between the left side of the left atrioventricular ring and the aortic ring. SYN: trigonum fibrosum sinistrum. lemniscal t. SYN: t. of lateral lemniscus. Lieutaud t. SYN: t. of bladder. Müller t. the floor of the supraoptic recess of the third ventricle. olfactory t. [TA] a grayish triangular area corresponding to the attachment of the olfactory peduncle (“olfactory nerve” or olfactory tract) to the base of the brain, at the anterior border of the anterior perforated substance. SYN: trigonum olfactorium [TA] . right fibrous t. (of heart) [TA] part of the fibrous skeleton of the heart located between the aortic fibrous ring and rings surrounding the right and left atrioventricular ostia. SYN: trigonum fibrosum dextrum. vagal (nerve) t. [TA] a prominence in the floor of the inferior fovea of the fourth ventricle that overlies the dorsal motor nucleus of the vagus. SYN: trigonum nervi vagi [TA] , t. of vagus nerve&star, trigonum vagale&star, ala cinerea, ashen wing, gray wing, vagi eminentia. t. of vagus nerve vagal (nerve) t.. ventricular t. SYN: collateral t.. vertebrocostal t. SYN: lumbocostal triangle of diaphragm.

trigonelline (trig-o-nel′en)
The methyl betaine of nicotinic acid; a product of the metabolism of nicotinic acid; excreted in the urine. SYN: caffearine, trigenolline.

trigonid (tri-gon′id, -go′nid)
The first three dominant cusps, taken collectively, of a lower molar tooth. SEE ALSO: trigone.

trigonitis (tri′go-ni′tis)
Inflammation of the urinary bladder, localized in the trigone. [trigone + G. -itis, inflammation]


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