| soutane | (noun) a long cassock with buttons down the front; worn by Roman Catholic priests | - |
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| sowbane | (noun) herb considered fatal to swine | Synonyms: Chenopodium hybridum, red goosefoot |
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| speakerphone | (noun) a telephone with a microphone and loudspeaker; can be used without picking up a handset; several people can participate in a call at the same time | - |
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| spine | (noun) a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: backbone |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, backbone, rachis, spinal column, vertebral column |
| (noun) a small sharp-pointed tip resembling a spike on a stem or leaf | Synonyms: pricker, prickle, spikelet, sticker, thorn |
| (noun) any sharply pointed projection | Synonyms: acantha, spur |
| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| spline | (noun) a thin strip (wood or metal) | Synonyms: slat |
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| (noun) a flexible strip (wood or rubber) used in drawing curved lines | - |
| spodumene | (noun) a pyroxene mineral consisting of lithium aluminum silicate; a source of lithium | - |
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| sthene | (noun) a unit of force equal to 1000 newtons | - |
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| stone | (noun) building material consisting of a piece of rock hewn in a definite shape for a special purpose | - |
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| (noun) a lack of feeling or expression or movement | - |
| (noun) a lump or mass of hard consolidated mineral matter | Synonyms: rock |
| (noun) the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed | Synonyms: endocarp, pit |
| (noun) an avoirdupois unit used to measure the weight of a human body; equal to 14 pounds | - |
| (noun) material consisting of the aggregate of minerals like those making up the Earth's crust | Synonyms: rock |
| (noun) a crystalline rock that can be cut and polished for jewelry | Synonyms: gem, gemstone |
| storyline | (noun) the plot of a book or play or film | Synonyms: plot line |
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| strapline | (noun) a secondary heading, especially one printed above another. | - |
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| strychnine | (noun) an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant | - |
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| styrene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, phenylethylene, vinylbenzene |
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| submarine | (noun) a submersible warship usually armed with torpedoes | Synonyms: pigboat, sub |
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| (noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States | Synonyms: bomber, Cuban sandwich, grinder, hero, hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, sub, submarine sandwich, torpedo, wedge, zep |
| subroutine | (noun) a set sequence of steps, part of larger computer program | Synonyms: function, procedure, routine, subprogram |
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| succinylcholine | (noun) a muscle relaxant for striated muscle that is used as an adjunct to anesthesia during certain surgical procedures | - |
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| sugarcane | (noun) tall tropical southeast Asian grass having stout fibrous jointed stalks; sap is a chief source of sugar | Synonyms: Saccharum officinarum, sugar cane |
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| (noun) juicy canes whose sap is a source of molasses and commercial sugar; fresh canes are sometimes chewed for the juice | Synonyms: sugar cane |
| sulfadiazine | (noun) a sulfa drug used in treating meningitis and pneumonia and other infections | - |
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| sulfamethazine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamezathine |
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| sulfamezathine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamethazine |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| sunshine | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, cheerfulness, sunniness |
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| (noun) the rays of the sun | Synonyms: sun, sunlight |
| (noun) moderate weather; suitable for outdoor activities | Synonyms: fair weather, temperateness |
| sunstone | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: aventurine |
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| swine | (noun) stout-bodied short-legged omnivorous animals | - |
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| sylvine | (noun) a mineral consisting of native potassium chloride; an important ore of potassium that is found in sedimentary beds | Synonyms: sylvite |
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| tailplane | (noun) the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged | Synonyms: horizontal stabiliser, horizontal stabilizer |
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| tambourine | (noun) a shallow drum with a single drumhead and with metallic disks in the sides | - |
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| tangerine | (noun) a reddish to vivid orange color | - |
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| (noun) any of various deep orange mandarins grown in the United States and southern Africa | - |
| (noun) a variety of mandarin orange, known in Telugu and Portugal as kamala kaya and in Australia as a mandarin | Synonyms: tangerine tree |
| tapeline | (noun) measuring instrument consisting of a narrow strip (cloth or metal) marked in inches or centimeters and used for measuring lengths | Synonyms: tape, tape measure |
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| taurine | (noun) a colorless crystalline substance obtained from the bile of mammals | - |
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| telephone | (noun) electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds | Synonyms: phone, telephone set |
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| (noun) transmitting speech at a distance | Synonyms: telephony |
| terbinafine | (noun) an oral antifungal drug (trade name Lamisil) used to treat cases of fungal nail disease | Synonyms: Lamisil |
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| terpene | (noun) an unsaturated hydrocarbon obtained from plants | - |
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| terpinene | (noun) any of a group of isomeric hydrocarbons that are classified as terpenes. | - |
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| terrine | (noun) a pate or fancy meatloaf baked in an earthenware casserole | - |
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| testosterone | (noun) a potent androgenic hormone produced chiefly by the testes; responsible for the development of male secondary sex characteristics | - |
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| tetracaine | (noun) a crystalline compound used in the form of a hydrochloride as a local anesthetic | - |
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| 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 |
| 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 |
| 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 | (noun) a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean | Synonyms: tramontana |
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| 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 | (noun) one living on or coming from the other side of the Alps from Italy | - |
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| transgene | (noun) an exogenous gene introduced into the genome of another organism | - |
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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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| 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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| trombone | (noun) a brass instrument consisting of a long tube whose length can be varied by a U-shaped slide | - |
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