| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| tetracycline | (noun) an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections | Synonyms: Achromycin |
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| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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| thane | (noun) a man ranking above an ordinary freeman and below a noble in Anglo-Saxon England (especially one who gave military service in exchange for land) | - |
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| (noun) a feudal lord or baron | - |
| theine | (noun) caffeine when present in tea. | - |
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| theophylline | (noun) a colorless crystalline alkaloid derived from tea leaves or made synthetically; used in medicine as a bronchial dilator | Synonyms: Elixophyllin, Slo-Bid, Theobid |
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| thiamine | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: aneurin, antiberiberi factor, thiamin, vitamin B1 |
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| thiazine | (noun) a compound made up of a ring of four carbon atoms and one sulfur atom and one nitrogen atom | - |
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| thighbone | (noun) the longest and thickest bone of the human skeleton; extends from the pelvis to the knee | Synonyms: femoris, femur |
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| thiodiphenylamine | (noun) a compound used primarily in veterinary medicine to rid farm animals of internal parasites | Synonyms: phenothiazine |
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| thioguanine | (noun) an antineoplastic drug used to treat acute leukemias | - |
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| thioridazine | (noun) a tranquilizer (trade name Mellaril) used to treat schizophrenia and other psychotic disorders | Synonyms: Mellaril |
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| thiothixene | (noun) a tranquilizer (trade name Navane) used to treat schizophrenia | Synonyms: Navane |
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| threonine | (noun) a colorless crystalline amino acid found in protein; occurs in the hydrolysates of certain proteins; an essential component of human nutrition | - |
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| throne | (noun) the position and power of an exalted person (a sovereign or bishop) who is entitled to sit in a chair of state on ceremonial occasions | - |
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| (noun) the chair of state for a monarch, bishop, etc. | - |
| (noun) a plumbing fixture for defecation and urination | Synonyms: can, commode, crapper, pot, potty, stool, toilet |
| (verb) put a monarch on the throne | Synonyms: enthrone |
| (verb) sit on the throne as a ruler | - |
| thylacine | (noun) rare doglike carnivorous marsupial of Tasmania having stripes on its back; probably extinct | Synonyms: Tasmanian tiger, Tasmanian wolf, Thylacinus cynocephalus |
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| thymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: deoxythymidine |
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| thymine | (noun) a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine | Synonyms: T |
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| thyronine | (noun) a phenolic amino acid of which thyroxine is a derivative | - |
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| thyroxine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxin |
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| timberline | (noun) line marking the upper limit of tree growth in mountains or northern latitudes | Synonyms: timber line, tree line |
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| timeline | (noun) a sequence of related events arranged in chronological order and displayed along a line (usually drawn left to right or top to bottom) | - |
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| tine | (noun) prong on a fork or pitchfork or antler | - |
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| tisane | (noun) infusion of e.g. dried or fresh flowers or leaves | - |
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| tolazoline | (noun) vasodilator that is used to treat spasms of peripheral blood vessels (as in acrocyanosis) | - |
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| toluene | (noun) a colorless flammable liquid obtained from petroleum or coal tar; used as a solvent for gums and lacquers and in high-octane fuels | Synonyms: methylbenzene |
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| tombstone | (noun) a stone that is used to mark a grave | Synonyms: gravestone, headstone |
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| tone | (noun) a quality of a given color that differs slightly from another color | Synonyms: shade, tincture, tint |
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| (noun) (music) the distinctive property of a complex sound (a voice or noise or musical sound) | Synonyms: quality, timber, timbre |
| (noun) (linguistics) a pitch or change in pitch of the voice that serves to distinguish words in tonal languages | - |
| (noun) the quality of something (an act or a piece of writing) that reveals the attitudes and presuppositions of the author | - |
| (noun) a steady sound without overtones | Synonyms: pure tone |
| (noun) a musical interval of two semitones | Synonyms: step, whole step, whole tone |
| (noun) the quality of a person's voice | Synonyms: tone of voice |
| (noun) a notation representing the pitch and duration of a musical sound | Synonyms: musical note, note |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavor, flavour, look, smell, spirit |
| (noun) the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli | Synonyms: tonicity, tonus |
| (verb) give a healthy elasticity to | Synonyms: strengthen, tone up |
| (verb) change to a color image | - |
| (verb) change the color or tone of | - |
| (verb) utter monotonously and repetitively and rhythmically | Synonyms: chant, intone |
| (verb) vary the pitch of one's speech | Synonyms: inflect, modulate |
| tonne | (noun) a unit of weight equivalent to 1000 kilograms | Synonyms: metric ton, MT, t |
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| tontine | (noun) an annuity scheme wherein participants share certain benefits and on the death of any participant his benefits are redistributed among the remaining participants; can run for a fixed period of time or until the death of all but one participant | - |
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| (noun) a form of life insurance whereby on the death or default of a participant his share is distributed to the remaining members | Synonyms: tontine insurance |
| touchline | (noun) either of the sidelines in soccer or rugby | - |
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| touchstone | (noun) a basis for comparison; a reference point against which other things can be evaluated | Synonyms: criterion, measure, standard |
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| tourmaline | (noun) a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones | - |
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| towline | (noun) (nautical) a rope used in towing | Synonyms: towing line, towing rope, towrope |
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| tragedienne | (noun) an actress who specializes in tragic roles | - |
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| tramline | (noun) the track on which trams or streetcars run | Synonyms: streetcar track, tramway |
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| tramontane | (adjective) on or coming from the other side of the mountains (from the speaker) | Synonyms: transmontane |
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| (adjective) being or coming from another country | - |
| (noun) a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean | Synonyms: tramontana |
| trampoline | (noun) gymnastic apparatus consisting of a strong canvas sheet attached with springs to a metal frame; used for tumbling | - |
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| transalpine | (adjective) on or relating to or characteristic of the region or peoples beyond the Alps from Italy (or north of the Alps) | Synonyms: ultramontane |
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| (noun) one living on or coming from the other side of the Alps from Italy | - |
| transgene | (noun) an exogenous gene introduced into the genome of another organism | - |
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| transmontane | (adjective) on or coming from the other side of the mountains (from the speaker) | Synonyms: tramontane |
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| transmundane | (adjective) existing or extending beyond the physical world | - |
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| tranylcypromine | (noun) an antidepressant drug that is a monoamine oxidase inhibitor; administered as a sulfate | - |
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| trazodone | (noun) oral antidepressant (trade name Desyrel) that is a nontricyclic drug used as a sedative | Synonyms: Desyrel, trazodone hydrochloride |
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| trephine | (noun) a surgical instrument used to remove sections of bone from the skull | Synonyms: trepan |
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| (verb) operate on with a trephine | - |
| triamcinolone | (noun) a synthetic corticosteroid (trade names Aristocort or Aristopak or Kenalog) used as an anti-inflammatory agent | Synonyms: Aristocort, Aristopak, Kenalog |
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| triazine | (noun) any of three isomeric compounds having three carbon and three nitrogen atoms in a six-membered ring | - |
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| tribromomethane | (noun) colorless liquid haloform CHBr3 | Synonyms: bromoform |
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| tribune | (noun) the apse of a Christian church that contains the bishop's throne | - |
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| (noun) (ancient Rome) an official elected by the plebeians to protect their interests | - |
| trichloroethane | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethylene |
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| trichloroethylene | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethane |
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| trichloromethane | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: chloroform |
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| tricorne | (noun) cocked hat with the brim turned up to form three points | Synonyms: tricorn |
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| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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| triiodothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: liothyronine, T |
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| trimipramine | (noun) tricyclic antidepressant drug (trade name Surmontil) used to treat depression and anxiety and (sometimes) insomnia | Synonyms: Surmontil |
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| trine | (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trinity, trio, triplet, troika |
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| trinitrotoluene | (noun) explosive consisting of a yellow crystalline compound that is a flammable toxic derivative of toluene | Synonyms: TNT |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| triune | (adjective) being three in one; used especially of the Christian Trinity | - |
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| trombone | (noun) a brass instrument consisting of a long tube whose length can be varied by a U-shaped slide | - |
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| trotline | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: setline, spiller, trawl, trawl line |
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| tryptophane | (noun) an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin | Synonyms: tryptophan |
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| tsine | (noun) wild ox of the Malay Archipelago | Synonyms: banteng, banting, Bos banteng |
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| tubocurarine | (noun) a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles | Synonyms: curare |
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| tune | (noun) the adjustment of a radio receiver or other circuit to a required frequency | - |
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| (noun) the property of producing accurately a note of a given pitch | - |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, line, melodic line, melodic phrase, melody, strain |
| (verb) adjust the pitches of (musical instruments) | Synonyms: tune up |
| (verb) adjust for (better) functioning | Synonyms: tune up |
| turbine | (noun) rotary engine in which the kinetic energy of a moving fluid is converted into mechanical energy by causing a bladed rotor to rotate | - |
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| turnstone | (noun) migratory shorebirds of the plover family that turn over stones in searching for food | - |
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| turpentine | (noun) an oleoresin obtained from conifers (especially pines) | Synonyms: gum terpentine |
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| (noun) volatile liquid distilled from turpentine oleoresin; used as paint thinner and solvent and medicinally | Synonyms: oil of turpentine, spirit of turpentine, turps |
| twine | (noun) a lightweight cord | Synonyms: string |
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| (verb) spin, wind, or twist together | Synonyms: enlace, entwine, interlace, intertwine, lace |
| (verb) make by twisting together or intertwining | - |
| (verb) arrange or coil around | Synonyms: roll, wind, wrap |
| (verb) form into a spiral shape | Synonyms: distort, twist |
| tyramine | (noun) amino acid derived from tyrosine; has a sympathomimetic action; found in chocolate and cola drinks and ripe cheese and beer | - |
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| tyrocidine | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidin |
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| tyrosine | (noun) an amino acid found in most proteins; a precursor of several hormones | - |
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| ubiquinone | (noun) any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration | Synonyms: coenzyme Q |
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| ultramarine | (adjective) of a brilliant pure blue to purplish blue color | - |
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| (noun) a vivid blue to purple-blue color | - |
| (noun) blue pigment made of powdered lapis lazuli | Synonyms: ultramarine blue |
| ultramontane | (adjective) of or relating to ultramontanism | - |
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| (adjective) on the Italian or Roman side of the Alps | Synonyms: cisalpine |
| (adjective) on or relating to or characteristic of the region or peoples beyond the Alps from Italy (or north of the Alps) | Synonyms: transalpine |
| (noun) a Roman Catholic who advocates ultramontanism (supreme papal authority in matters of faith and discipline) | - |
| underdone | (adjective) insufficiently cooked | Synonyms: half-baked |
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| underline | (noun) a line drawn underneath (especially under written matter) | Synonyms: underscore |
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| (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underscore |
| (verb) draw a line or lines underneath to call attention to | Synonyms: underscore |
| undermine | (verb) hollow out as if making a cave or opening | Synonyms: cave |
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| (verb) destroy property or hinder normal operations | Synonyms: counteract, countermine, sabotage, subvert, weaken |
| undertone | (noun) a pale or subdued color | Synonyms: tinge |
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| (noun) a subdued emotional quality underlying an utterance; implicit meaning | Synonyms: undercurrent |
| (noun) a quiet or hushed tone of voice | - |
| undine | (noun) any of various female water spirits | - |
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| undiscipline | (noun) the trait of lacking discipline | Synonyms: indiscipline |
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| undone | (adjective) thrown into a state of disorganization or incoherence | Synonyms: unstuck |
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| (adjective) not fastened or tied or secured | - |
| (adjective) not done | - |
| (adjective) doomed to extinction | Synonyms: done for, ruined, sunk, washed-up |
| unfeminine | (adjective) not suitable for a woman | - |
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| untune | (verb) cause to be out of tune | - |
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| (verb) cause to lose one's composure | Synonyms: discomfit, discompose, disconcert, upset |
| untwine | (verb) undo what has been twined together | - |
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| urbane | (adjective) showing a high degree of refinement and the assurance that comes from wide social experience | Synonyms: polished, refined |
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| urethane | (noun) an ester of carbamic acid | - |
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| urine | (noun) liquid excretory product | Synonyms: pee, piddle, piss, water, weewee |
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| ursine | (adjective) of or relating to or similar to bears | - |
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| uterine | (adjective) of or involving the uterus | - |
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| vaccine | (noun) immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies | Synonyms: vaccinum |
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| valentine | (noun) a sweetheart chosen to receive a greeting on Saint Valentine's Day | - |
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| valine | (noun) an essential amino acid found in proteins; important for growth in children and nitrogen balance in adults | - |
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| vane | (noun) the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft | Synonyms: web |
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| (noun) mechanical device attached to an elevated structure; rotates freely to show the direction of the wind | Synonyms: weather vane, weathervane, wind vane |
| (noun) flat surface that rotates and pushes against air or water | Synonyms: blade |
| (noun) a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it | - |