| trinketry | (noun) trinkets and other ornaments of dress collectively | - |
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| trio | (noun) a musical composition for three performers | - |
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| (noun) three people considered as a unit | Synonyms: threesome, triad, trinity |
| (noun) a set of three similar things considered as a unit | Synonyms: triad, triple, triplet |
| (noun) three performers or singers who perform together | - |
| (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, trine, trinity, triplet, troika |
| triode | (noun) a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible | - |
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| triolein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: olein |
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| triose | (noun) any monosaccharide sugar containing three atoms of carbon per molecule | - |
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| trioxide | (noun) an oxide containing three atoms of oxygen in the molecule | - |
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| trip | (noun) a journey for some purpose (usually including the return) | - |
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| (noun) an unintentional but embarrassing blunder | Synonyms: misstep, stumble, trip-up |
| (noun) a light or nimble tread | - |
| (noun) a catch mechanism that acts as a switch | Synonyms: tripper |
| (noun) an accidental misstep threatening (or causing) a fall | Synonyms: slip |
| (noun) an exciting or stimulating experience | Synonyms: head trip |
| (noun) a hallucinatory experience induced by drugs | - |
| tripalmitin | (noun) a triglyceride of palmitic acid | Synonyms: glycerol tripalmitate |
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| tripe | (noun) nonsensical talk or writing | Synonyms: applesauce, codswallop, folderol, rubbish, trash, trumpery, wish-wash |
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| (noun) lining of the stomach of a ruminant (especially a bovine) used as food | - |
| triphammer | (noun) a massive power hammer; raised by a cam until released to fall under gravity | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| triple | (noun) a base hit at which the batter stops safely at third base | Synonyms: three-bagger, three-base hit |
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| (noun) a quantity that is three times as great as another | - |
| (noun) a set of three similar things considered as a unit | Synonyms: triad, trio, triplet |
| triplet | (noun) a set of three similar things considered as a unit | Synonyms: triad, trio, triple |
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| (noun) one of three offspring born at the same time from the same pregnancy | - |
| (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, trine, trinity, trio, troika |
| tripletail | (noun) large food fish of warm waters worldwide having long anal and dorsal fins that with a caudal fin suggest a three-lobed tail | - |
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| triplicate | (noun) one of three copies; any of three things that correspond to one another exactly | - |
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| triplicity | (noun) the property of being triple | - |
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| (noun) (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees | Synonyms: trigon |
| tripling | (noun) increase by a factor of three | - |
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| tripod | (noun) a three-legged rack used for support | - |
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| tripoli | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: rottenstone |
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| tripos | (noun) final honors degree examinations at Cambridge University | - |
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| tripper | (noun) a catch mechanism that acts as a switch | Synonyms: trip |
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| (noun) a tourist who is visiting sights of interest | Synonyms: excursionist, rubberneck, sightseer |
| (noun) a walker or runner who trips and almost falls | Synonyms: stumbler |
| (noun) (slang) someone who has taken a psychedelic drug and is undergoing hallucinations | - |
| tripton | (noun) The inorganic particulate matter suspended in bodies of water such as lakes and seas. | - |
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| triptych | (noun) art consisting of a painting or carving (especially an altarpiece) on three panels (usually hinged together) | - |
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| triquetral | (noun) a wrist bone that articulates with the pisiform and hamate and lunate bones | Synonyms: cuneiform bone, os triquetrum, pyramidal bone, triquetral bone |
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| trireme | (noun) ancient Greek or Roman galley or warship having three tiers of oars on each side | - |
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| trisaccharide | (noun) any of a variety of carbohydrates that yield three monosaccharide molecules on complete hydrolysis | - |
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| triskaidekaphobia | (noun) a morbid fear of the number 13 | - |
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| triskele | (noun) a figure consisting of three stylized human arms or legs (or three bent lines) radiating from a center | Synonyms: triskelion |
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| triskelion | (noun) a figure consisting of three stylized human arms or legs (or three bent lines) radiating from a center | Synonyms: triskele |
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| trismus | (noun) prolonged spasm of the jaw muscles | - |
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| trisomy | (noun) chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell | - |
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| tristearin | (noun) a triglyceride of stearic acid | Synonyms: glycerol tristearate |
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| trisyllable | (noun) a word having three syllables | - |
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| tritanopia | (noun) rare form of dichromacy characterized by a lowered sensitivity to blue light resulting in an inability to distinguish blue and yellow | Synonyms: blue-blindness |
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| triteness | (noun) unoriginality as a result of being dull and hackneyed | Synonyms: staleness |
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| tritheism | (noun) (Christianity) the heretical belief that the Father and the Son and the Holy Spirit are three separate gods | - |
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| tritheist | (noun) someone (not an orthodox Christian) who believes that the Father and Son and Holy Ghost are three separate gods | - |
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| tritium | (noun) a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms | - |
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| tritoma | (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, flameflower, kniphofia |
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| triton | (noun) small usually bright-colored semiaquatic salamanders of North America and Europe and northern Asia | Synonyms: newt |
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| (noun) tropical marine gastropods having beautifully colored spiral shells | - |
| triumph | (noun) a successful ending of a struggle or contest | Synonyms: victory |
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| (noun) the exultation of victory | - |
| triumvir | (noun) one of a group of three sharing public administration or civil authority especially in ancient Rome | - |
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| triumvirate | (noun) a group of three men responsible for public administration or civil authority | - |
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| trivet | (noun) a stand with short feet used under a hot dish on a table | - |
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| (noun) a three-legged metal stand for supporting a cooking vessel in a hearth | - |
| trivia | (noun) something of small importance | Synonyms: small beer, trifle, triviality |
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| triviality | (noun) something of small importance | Synonyms: small beer, trifle, trivia |
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| (noun) the quality of being unimportant and petty or frivolous | Synonyms: pettiness, puniness, slightness |
| (noun) a detail that is considered insignificant | Synonyms: trifle |
| trivium | (noun) (Middle Ages) an introductory curriculum at a medieval university involving grammar and logic and rhetoric; considered to be a triple way to eloquence | - |
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| ultracentrifugation | (noun) centrifugation at very high speeds | - |
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| ultracentrifuge | (noun) a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins | - |
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| ununtrium | (noun) a radioactive transuranic element, with atomic number 113 | Synonyms: atomic number 113, element 113, Uut |
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| utricle | (noun) a small pouch into which the semicircular canals open | Synonyms: utriculus |
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| utriculus | (noun) a small pouch into which the semicircular canals open | Synonyms: utricle |
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| vasoconstriction | (noun) decrease in the diameter of blood vessels | - |
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| vasoconstrictive | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: pressor, vasoconstrictor |
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| vasoconstrictor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: pressor, vasoconstrictive |
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| ventricle | (noun) a chamber of the heart that receives blood from an atrium and pumps it to the arteries | Synonyms: heart ventricle |
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| (noun) one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid | - |
| ventriculus | (noun) thick-walled muscular pouch below the crop in many birds and reptiles for grinding food | Synonyms: gastric mill, gizzard |
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| ventriloquism | (noun) the art of projecting your voice so that it seems to come from another source (as from a ventriloquist's dummy) | Synonyms: ventriloquy |
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| ventriloquist | (noun) a performer who projects the voice into a wooden dummy | - |
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| ventriloquy | (noun) the art of projecting your voice so that it seems to come from another source (as from a ventriloquist's dummy) | Synonyms: ventriloquism |
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| vitrification | (noun) the process of becoming vitreous | - |
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| (noun) a vitrified substance; the glassy result of being vitrified | - |
| vitrine | (noun) a glass container used to store and display items in a shop or museum or home | Synonyms: case, display case, showcase |
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| vitriol | (noun) abusive or venomous language used to express blame or censure or bitter deep-seated ill will | Synonyms: invective, vituperation |
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| (noun) (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry | Synonyms: oil of vitriol, sulfuric acid, sulphuric acid |
| weatherstrip | (noun) a narrow strip of material to cover the joint of a door or window to exclude the cold | Synonyms: weather strip, weather stripping, weatherstripping |
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| weatherstripping | (noun) a narrow strip of material to cover the joint of a door or window to exclude the cold | Synonyms: weather strip, weather stripping, weatherstrip |
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| wintriness | (noun) The state or quality of being suggestive or characteristic of winter; cold, stormy. | - |
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| yttrium | (noun) a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys | Synonyms: atomic number 39, Y |
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