| transistor | (noun) a semiconductor device capable of amplification | Synonyms: electronic transistor, junction transistor |
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| translator | (noun) a program that translates one programming language into another | Synonyms: translating program |
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| (noun) someone who mediates between speakers of different languages | Synonyms: interpreter |
| (noun) a person who translates written messages from one language to another | Synonyms: transcriber |
| tremor | (noun) an involuntary vibration (as if from illness or fear) | Synonyms: shudder |
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| (noun) a small earthquake | Synonyms: earth tremor, microseism |
| (noun) shaking or trembling (usually resulting from weakness or stress or disease) | - |
| (verb) shake with seismic vibrations | Synonyms: quake |
| tricolor | (adjective) having or involving three colors | Synonyms: trichromatic, trichrome |
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| (noun) a flag having three colored stripes (especially the French flag) | Synonyms: tricolour |
| trustor | (noun) (law) a person who creates a trust by giving real or personal property in trust to a trustee for the benefit of a beneficiary; a person who gives such property is said to settle it on the trustee | Synonyms: settlor |
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| tumor | (noun) an abnormal new mass of tissue that serves no purpose | Synonyms: neoplasm, tumour |
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| turbogenerator | (noun) generator consisting of a steam turbine coupled to an electric generator for the production of electric power | - |
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| turgor | (noun) (biology) the normal rigid state of fullness of a cell or blood vessel or capillary resulting from pressure of the contents against the wall or membrane | - |
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| tutor | (noun) a person who gives private instruction (as in singing, acting, etc.) | Synonyms: coach, private instructor |
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| (verb) be a tutor to someone; give individual instruction | - |
| (verb) act as a guardian to someone | - |
| ulterior | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, subterraneous |
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| (adjective) beyond or outside an area of immediate interest; remote | - |
| (adjective) coming at a subsequent time or stage | Synonyms: later, posterior |
| urinator | (noun) a person who urinates | Synonyms: pisser |
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| utahraptor | (noun) large (20-ft) and swift carnivorous dinosaur having an upright slashing claw 15 inches long on each hind foot; early Cretaceous | Synonyms: superslasher |
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| uxor | (noun) (legal terminology) the Latin word for wife | Synonyms: ux. |
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| vaccinator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: inoculator |
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| vacillator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, hesitator, waverer |
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| valor | (noun) the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle) | Synonyms: gallantry, heroism, valiance, valiancy, valorousness, valour |
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| valuator | (noun) one who estimates officially the worth or value or quality of things | Synonyms: appraiser |
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| vapor | (noun) the process of becoming a vapor | Synonyms: evaporation, vaporisation, vaporization, vapour |
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| (noun) a visible suspension in the air of particles of some substance | Synonyms: vapour |
| 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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| vasodilator | (noun) a drug that causes dilation of blood vessels | Synonyms: vasodilative |
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| vasomotor | (adjective) relating to the nerves and muscles that cause the blood vessels to constrict or dilate | - |
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| vasopressor | (noun) any agent that produces vasoconstriction and a rise in blood pressure (usually understood as increased arterial pressure) | - |
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| vaticinator | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, prophet, seer |
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| vector | (noun) (genetics) a virus or other agent that is used to deliver DNA to a cell | - |
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| (noun) a variable quantity that can be resolved into components | - |
| (noun) any agent (person or animal or microorganism) that carries and transmits a disease | Synonyms: transmitter |
| (noun) a straight line segment whose length is magnitude and whose orientation in space is direction | - |
| velociraptor | (noun) small active carnivore that probably fed on protoceratops; possibly related more closely to birds than to other dinosaurs | - |
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| vendor | (noun) someone who promotes or exchanges goods or services for money | Synonyms: marketer, seller, trafficker, vender |
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| venerator | (noun) someone who regards with deep respect or reverence | - |
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| ventilator | (noun) a device (such as a fan) that introduces fresh air or expels foul air | - |
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| (noun) a device that facilitates breathing in cases of respiratory failure | Synonyms: breathing apparatus, breathing device, breathing machine |
| vibrator | (noun) mechanical device that produces vibratory motion; used for massage | - |
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| (noun) a mechanical device that vibrates | - |
| victor | (noun) the contestant who wins the contest | Synonyms: winner |
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| (noun) a combatant who is able to defeat rivals | Synonyms: master, superior |
| vigor | (noun) active strength of body or mind | Synonyms: dynamism, heartiness, vigour |
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| (noun) an imaginative lively style (especially style of writing) | Synonyms: energy, muscularity, vigour, vim |
| (noun) forceful exertion | Synonyms: energy, vigour, zip |
| vindicator | (noun) a person who argues to defend or justify some policy or institution | Synonyms: apologist, justifier |
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| violator | (noun) someone who assaults others sexually | Synonyms: debaucher, ravisher |
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| (noun) someone who violates the law | Synonyms: law offender, lawbreaker |
| visitor | (noun) someone who visits | Synonyms: visitant |
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| visor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, vizor |
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| (noun) a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face | Synonyms: vizor |
| vizor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, visor |
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| (noun) a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face | Synonyms: visor |
| vociferator | (noun) a loud and vehement speaker (usually in protest) | - |
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| warrantor | (noun) one who provides a warrant or guarantee to another | Synonyms: guarantor, surety, warranter |
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| warrior | (noun) someone engaged in or experienced in warfare | - |
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| watercolor | (noun) the art or technique of painting with watercolors | Synonyms: water-color, water-colour, watercolour |
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| (noun) a painting produced with watercolors | Synonyms: water-color, water-colour, watercolour |
| (noun) a water-base paint (with water-soluble pigments); used by artists | Synonyms: water-color, water-colour, watercolour |
| (noun) water-soluble pigment | Synonyms: water-color, water-colour, watercolour |
| (verb) paint with watercolors | Synonyms: watercolour |