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Medical Dictionary


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trigonocephalic (trig′o-no-se-fal′ik)
Pertaining to trigonocephaly.

trigonocephaly (trig′o-no-sef′a-le, tri′go-no-)
Malformation characterized by a triangular configuration of the skull, due in part to premature synostosis of the cranial bones with compression of the cerebral hemispheres. [trigone + G. kephale, head]

trigonum, pl .trigona (tri-go′num, -na) [TA]
Any triangular area. See triangle. SYN: trigone (1) [TA] . [L., fr. G. trigonon, a triangle] t. auscultationis [TA] SYN: ausculatory triangle. t. caroticum [TA] SYN: carotid triangle. t. cerebrale SYN: fornix (2) . t. cervicale any one of the triangles of the neck. SYN: t. colli. t. cervicale anterius anterior cervical region. t. cervicale posterius lateral cervical region. t. clavipectorale [TA] SYN: clavipectoral triangle. t. collaterale [TA] SYN: collateral trigone. t. colli SYN: t. cervicale. t. colli anterius anterior cervical region. t. colli laterale lateral cervical region. t. cystohepaticum [TA] SYN: cystohepatic triangle. t. deltoideopectorale SYN: clavipectoral triangle. t. deltopectorale clavipectoral triangle. t. femorale [TA] SYN: femoral triangle. t. femoris femoral triangle. trigona fibrosa cordis right fibrous trigone (of heart), left fibrous trigone (of heart). t. fibrosum dextrum SYN: right fibrous trigone (of heart). t. fibrosum sinistrum SYN: left fibrous trigone (of heart). t. habenulae [TA] SYN: habenular trigone. t. hypoglossi SYN: hypoglossal trigone. t. inguinale [TA] SYN: inguinal triangle. t. lemnisci lateralis [TA] SYN trigone of lateral lemniscus. t. lumbale inferius [TA] SYN: inferior lumbar triangle. t. lumbocostale diaphragmatis [TA] SYN: lumbocostal triangle of diaphragm. t. musculare (regionis cervicalis anterioris) [TA] SYN: muscular triangle (of neck). t. nervi acustici SYN: trigone of auditory nerve. t. nervi hypoglossi [TA] SYN: hypoglossal trigone. t. nervi vagi [TA] SYN: vagal (nerve) trigone. t. olfactorium [TA] SYN: olfactory trigone. t. omoclaviculare [TA] SYN: supraclavicular triangle. t. omotracheale muscular triangle (of neck). t. palati SYN: palatal triangle. t. parietale laterale pelvis [TA] SYN: lateral pelvic wall triangle. t. retromolare [TA] SYN: retromolar triangle. t. sternocostale a muscular defect in the diaphragm between the costal and the sternal portions. SYN: Larrey cleft, sternocostal triangle. t. sternocostale diaphragmatis [TA] SYN: sternocostal triangle (of diaphragm). t. submandibulare [TA] SYN: submandibular triangle. t. submentale [TA] SYN: submental triangle. t. vagale vagal (nerve) trigone. t. ventriculi SYN: collateral trigone. t. vesicae [TA] SYN: trigone of bladder.

trihexosylceramide
SYN: globotriaosylceramide.

trihexyphenidyl hydrochloride (tri-heks′e-fen′i-dil)
A synthetic anticholinergic agent reputed to exert a higher degree of anticholinergic activity in the brain as compared with peripheral parasympathetic neuroeffector junctions. Widely used in the treatment of parkinsonism secondary to idiopathic or neuroleptic-induced parkinsonism.

trihybrid (tri-hi′brid)
The offspring of parents that differ in three mendelian characters. [tri- + L. hybrida, hybrid]

trihydric (tri-hi′drik)
Denoting a chemical compound containing three replaceable hydrogen atoms.

trihydroxyestrin (tri′hi-drok′se-es′trin)
SYN: estriol.

triiniodymus (tri-in′i-od′i-mus)
A grossly malformed fetus with three heads, joined at the occiput, and a single body. [tri- + G. inion, nape of the neck, + didymos, twin]

triiodide (tri-i′o-did, -did)
An iodide with three atoms of iodine in the molecule; e.g., KI3.

triiodomethane (tri-i′o-do-meth′an)
SYN: iodoform.

3,5,3′-triiodothyronine (TITh, T3) (tri-i′o-do-thi′ro-nen)
A thyroid hormone normally synthesized in smaller quantities than thyroxine; present in blood and thyroid gland and exerts the same biologic effects as thyroxine but, on a molecular basis, is more potent and the onset of its effect is more rapid.

triketohydrindene hydrate (tri-ke-to-hi′drin-den)
Former name for ninhydrin.

triketopurine (tri-ke-to-pur′en)
SYN: uric acid.

trilabe (tri′lab)
A three-pronged forceps for removal of foreign bodies from the bladder. [tri- + G. labe, a handle, hold]

trilaminar (tri-lam′i-nar)
Having three laminae.

trilateral (tri-lat′e-ral)
Having three sides.

trilobate, trilobed (tri-lo′bat, tri′lobd)
Having three lobes.

trilocular (tri-lok′u-lar)
Having three cavities or cells.

trilogy (tril′o-je)
A triad of related entities. [G. trilogia, fr. tri- + logos, study, discourse] t. of Fallot a set of congenital defects including pulmonic stenosis, atrial septal defect, and right ventricular hypertrophy. SYN: Fallot triad.

trilostane (tri′lo-stan)
An adrenal steroid inhibitor used for amelioration of adrenal hyperfunction in Cushing syndrome.

trimastigote (tri-mas′ti-got)
Having three flagella, as observed in certain protozoan organisms. [tri- + G. mastix, whip]

trimeprazine tartrate (tri-mep′ra-zen)
A phenothiazine compound related chemically and pharmacologically to promazine but with a more pronounced histamine-antagonizing action; used for the symptomatic relief of pruritus.

trimer (tri′mer)
A compound, complex, or structure made up of three components.

trimester (tri′mes-ter, tri-mes′ter)
A period of 3 months; one-third of the length of a pregnancy. [L. trimestris, of three-month duration]

trimetaphan camsylate (tri-met′a-fan)
SYN: trimethaphan camsylate.

trimetazidine (tri-me-taz′i-den)
A coronary vasodilator.

trimethadione (tri′meth-a-di′on)
An obsolescent anticonvulsant used for the treatment of absence seizures (petit mal) and psychomotor epilepsy. SYN: troxidone.

trimethaphan camsylate (tri-meth′a-fan)
A ganglionic blocking agent that produces vasodilation of brief duration; used in surgery, particularly neurosurgery, to produce a relatively bloodless operative field (controlled hypotension). SYN: trimetaphan camsylate.

trimethidium methosulfate (tri-me-thid′e-um meth-o-sul′fat)
Quaternary ammonium compound that blocks ganglionic transmission at sympathetic and parasympathetic ganglia; used in the treatment of severe hypertension.

trimethobenzamide hydrochloride (tri′meth-o-ben′za-mid)
An antiemetic.

trimethoprim (tri-meth′o-prim)
An antimicrobial agent that potentiates the effect of sulfonamides and sulfones; usually used in combination with sulfamethoxazole.

trimethoprim-sulfamethoxazole
A drug combination consisting of a dihydrofolate reductase inhibitor (trimethoprim) and a sulfonamide antibacterial drug (sulfamethoxazole). The drug combination is synergistic as the drugs interfere with two successive steps in the formation/utilization of folic acid by microorganisms. Used to treat many infectious diseases.

trimethylamine (tri-meth′il-am′en)
A degradation product, often by putrefaction, of nitrogenous plant and animal substances such as beet sugar residue or herring brine; in the body, it probably results from decomposition of choline.

trimethylaminuria (tri-meth′il-am-i-noor′e-a)
Increased excretion of trimethylamine in urine and sweat, with characteristic offensive fishy body odor.

trimethylcarbinol (tri-meth′il-kar′bin-ol)
Tertiary butyl alcohol. See butyl alcohol.

trimethylene (tri-meth′il-en)
SYN: cyclopropane.

trimethylethylene (tri-meth-il-eth′il-en)
SYN: amylene.

trimethylomelamine (tri′meth-i-lo-mel′a-men)
An antineoplastic agent.

trimetozine (tri-met′o-zen)
An antianxiety agent.

trimetrexate (tri-me-treks′at)
An antineoplastic agent and antiprotozoal orphan drug used in the treatment of Pneumocystis carinii pneumonia in AIDS patients.

trimipramine (tri-mip′ra-men)
An antidepressant.

trimorphic (tri-mor′fik)
SYN: trimorphous.

trimorphism (tri-mor′fizm)
Existence under three forms, as in holometabolous insects that pass through larval, pupal, and imago stages. [tri- + G. morphe, form]

trimorphous (tri-mor′fus)
Existing under three forms; marked by trimorphism. SYN: trimorphic.

trinitrocellulose (tri′ni-tro-sel′u-los)
A constituent of soluble guncotton; used in the preparation of collodion and of pyroxylin.

trinitroglycerin (tri′ni-tro-glis′e-rin)
SYN: nitroglycerin.

trinitrotoluene (TNT) (tri′ni-tro-tol′u-en)
An explosive made by the nitrification of toluene; it causes gastric and intestinal disturbances and dermatitis in workers in munition factories. SYN: trinitrotoluol.

trinitrotoluol (tri′ni-tro-tol′u-ol)
SYN: trinitrotoluene.

trinucleotide (tri-noo′kle-o-tid)
A combination of three adjacent nucleotides, free or in a polynucleotide or nucleic acid molecule; often used with specific reference to the unit (codon or anticodon) specifying a particular amino acid in expression of the genetic code.

triokinase (tri-o-ki′nas)
A phosphotransferase catalyzing the phosphorylation of d-glyceraldehyde by ATP to produce d-glyceraldehyde 3-phosphate and ADP; participates in a step in d-fructose metabolism. SYN: triosekinase.

triol (tri-ol)
A compound containing three hydroxyl groups; E.G., glycerol.

triolein (tri-o′le-in)
SYN: olein.

triophthalmos (tri-of-thal′mos)
Conjoined twins with union in the facial region such that there is a common eye on the joined sides; a variety of opodidymus. See conjoined twins, under twin. [tri- + G. ophthalmos, eye]

triorchism (tri-or′kizm)
Condition of having three testes.

triorthocresyl phosphate (TOCP) (tri′-or-tho-kres′il)
A triaryl phosphate; produces a delayed neurotoxicity. An infamous incident occurred when it appeared as an adulterant in Jamaica ginger and was responsible for thousands of cases of paralysis during the Prohibition era.

triose (tri′os)
A three-carbon monosaccharide; e.g., glyceraldehyde and dihydroxyacetone.

triosekinase (tri′os-ki′nas)
SYN: triokinase.

triosephosphate isomerase (tri′os-fos′fat)
An isomerizing enzyme that catalyzes the reversible interconversion of d-glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, a reaction of importance in glycolysis and gluconeogenesis; a deficiency of this enzyme will result in hemolytic anemia and severe neurologic deficits. SYN: phosphotriose isomerase.

triotus (tri-o′tus)
Diprosopus in which three ears are present. [tri- + G. ous, ear]

trioxide (tri-oks′id)
A molecule containing three atoms of oxygen. SYN: teroxide.

trioxsalen (tri-ok′sa-len)
An orally effective pigmenting, photosensitizing agent; used as a tanning agent and in the treatment of vitiligo.

trioxymethylene (tri′ok-se-meth′i-len)
SYN: paraformaldehyde.

tripalmitin (tri-pal′mi-tin)
SYN: palmitin.

triparanol (tri-par′a-nol)
Formerly used as inhibitor of cholesterol biosynthesis but withdrawn from the market because it promoted the formation of cataracts.

tripelennamine hydrochloride (tri-pe-len′a-men)
An antihistamine. Also available, with the same actions, is t. citrate; it is less bitter than the hydrochloride salt, and is therefore used in elixir.

tripeptidases (tri-pep′ti-das-es)
A class of enzymes of different specificities that catalyzes the hydrolysis of tripeptides, producing a dipeptide and an amino acid.




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