| tangent | (noun) ratio of the opposite to the adjacent side of a right-angled triangle | Synonyms: tan |
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| (noun) a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point | - |
| tapotement | (noun) massage in which the body is tapped rhythmically with the fingers or with short rapid movements of the sides of the hand; used to loosen mucus on the chest walls of patients with bronchitis | - |
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| taunt | (noun) aggravation by deriding or mocking or criticizing | Synonyms: taunting, twit |
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| tegument | (noun) a natural protective body covering and site of the sense of touch | Synonyms: cutis, skin |
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| temperament | (noun) an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys | - |
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| (noun) your usual mood | Synonyms: disposition |
| (noun) excessive emotionalism or irritability and excitability (especially when displayed openly) | - |
| tenant | (noun) someone who pays rent to use land or a building or a car that is owned by someone else | Synonyms: renter |
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| (noun) any occupant who dwells in a place | - |
| (noun) a holder of buildings or lands by any kind of title (as ownership or lease) | - |
| tenement | (noun) a run-down apartment house barely meeting minimal standards | Synonyms: tenement house |
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| tent | (noun) a portable shelter (usually of canvas stretched over supporting poles and fastened to the ground with ropes and pegs) | Synonyms: collapsible shelter |
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| (noun) a web that resembles a tent or carpet | - |
| termagant | (noun) a scolding nagging bad-tempered woman | Synonyms: shrew |
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| testament | (noun) a profession of belief | - |
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| (noun) a legal document declaring a person's wishes regarding the disposal of their property when they die | Synonyms: will |
| (noun) strong evidence for something | - |
| thecodont | (noun) presumably in the common ancestral line to dinosaurs and crocodiles and birds | Synonyms: thecodont reptile |
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| thumbprint | (noun) fingerprint made by the thumb (especially by the pad of the thumb) | - |
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| tint | (noun) a quality of a given color that differs slightly from another color | Synonyms: shade, tincture, tone |
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| (noun) a just detectable amount | Synonyms: hint, suggestion, trace |
| (noun) a dye for coloring the hair | Synonyms: hair coloring, hair dye |
| topgallant | (noun) a mast fixed to the head of a topmast on a square-rigged vessel | Synonyms: topgallant mast |
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| (noun) a sail set on a yard of a topgallant mast | Synonyms: topgallant sail |
| torment | (noun) the act of harassing someone | Synonyms: badgering, bedevilment, worrying |
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| (noun) a severe affliction | Synonyms: curse |
| (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: agony, torture |
| (noun) extreme mental distress | Synonyms: anguish, torture |
| (noun) a feeling of intense annoyance caused by being tormented | Synonyms: harassment |
| (noun) unbearable physical pain | Synonyms: torture |
| torrent | (noun) a violently fast stream of water (or other liquid) | Synonyms: violent stream |
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| (noun) a heavy rain | Synonyms: cloudburst, deluge, downpour, pelter, soaker, waterspout |
| (noun) an overwhelming number or amount | Synonyms: deluge, flood, inundation |
| tournament | (noun) a sporting competition in which contestants play a series of games to decide the winner | Synonyms: tourney |
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| (noun) a series of jousts between knights contesting for a prize | - |
| toxicant | (noun) any substance that causes injury or illness or death of a living organism | Synonyms: poison, poisonous substance |
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| trachodont | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodon |
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| traducement | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, obloquy |
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| transient | (noun) (physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load | - |
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| (noun) one who stays for only a short time | - |
| transplant | (noun) the act of removing something from one location and introducing it in another location | Synonyms: transplantation, transplanting |
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| (noun) an operation moving an organ from one organism (the donor) to another (the recipient) | Synonyms: organ transplant, transplantation |
| (noun) (surgery) tissue or organ transplanted from a donor to a recipient; in some cases the patient can be both donor and recipient | Synonyms: graft |
| transshipment | (noun) the transfer from one conveyance to another for shipment | - |
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| treatment | (noun) care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury) | Synonyms: intervention |
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| (noun) the management of someone or something | Synonyms: handling |
| (noun) (medicine) the act of caring for someone (as by medication or remedial training etc.) | Synonyms: therapy |
| (noun) a manner of dealing with something artistically | - |
| (noun) an extended communication (often interactive) dealing with some particular topic | Synonyms: discourse, discussion |
| trident | (noun) a spear with three prongs | - |
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| truant | (noun) one who is absent from school without permission | Synonyms: hooky player |
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| (noun) someone who shirks duty | Synonyms: no-show, nonattender |
| tyrant | (noun) a cruel and oppressive dictator | Synonyms: autocrat, despot |
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| (noun) any person who exercises power in a cruel way | - |
| (noun) in ancient Greece, a ruler who had seized power without legal right to it | - |
| unconstraint | (noun) the trait of lacking restraint or control; reckless freedom from inhibition or worry | Synonyms: abandon, wantonness |
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| underachievement | (noun) poorer than expected performance (poorer than might have been predicted from intelligence tests) | - |
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| undercurrent | (noun) a subdued emotional quality underlying an utterance; implicit meaning | Synonyms: undertone |
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| (noun) a current below the surface of a fluid | Synonyms: undertide |
| underdevelopment | (noun) (photography) inadequate processing of film resulting in inadequate contrast | - |
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| (noun) state of inadequate development | - |
| undergarment | (noun) a garment worn under other garments | Synonyms: unmentionable |
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| underlayment | (noun) a pad placed under a carpet | Synonyms: carpet pad, rug pad, underlay |
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| undernourishment | (noun) not having enough food to develop or function normally | Synonyms: malnourishment |
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| underpayment | (noun) the act of paying less than required | - |
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| (noun) a payment smaller than needed or expected | - |
| understatement | (noun) a statement that is restrained in ironic contrast to what might have been said | - |
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| unemployment | (noun) the state of being unemployed or not having a job | - |
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| unenlightenment | (noun) a lack of understanding | - |
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| unguent | (noun) semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation | Synonyms: balm, ointment, salve, unction |
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| unrestraint | (noun) the quality of lacking restraint | - |
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| vagrant | (noun) a wanderer who has no established residence or visible means of support | Synonyms: clochard, drifter, floater, vagabond |
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| variant | (noun) a variable quantity that is random | Synonyms: chance variable, random variable, stochastic variable, variate |
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| (noun) something a little different from others of the same type | Synonyms: edition, variation, version |
| (noun) an event that departs from expectations | Synonyms: discrepancy, variance |
| (noun) (biology) a group of organisms within a species that differ in trivial ways from similar groups | Synonyms: form, strain, var. |
| varment | (noun) any usually predatory wild animal considered undesirable; e.g., coyote | Synonyms: varmint |
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| varmint | (noun) any usually predatory wild animal considered undesirable; e.g., coyote | Synonyms: varment |
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| (noun) an irritating or obnoxious person | Synonyms: vermin |
| vaunt | (noun) extravagant self-praise | - |
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| vent | (noun) activity that frees or expresses creative energy or emotion | Synonyms: outlet, release |
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| (noun) external opening of urinary or genital system of a lower vertebrate | - |
| (noun) a hole for the escape of gas or air | Synonyms: blowhole, vent-hole, venthole |
| (noun) a slit in a garment (as in the back seam of a jacket) | - |
| (noun) a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt | Synonyms: volcano |
| versant | (noun) the side or slope of a mountain | Synonyms: mountainside |
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| vesicant | (noun) a chemical agent that causes blistering (especially mustard gas) | Synonyms: vesicatory |
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| vestment | (noun) gown (especially ceremonial garments) worn by the clergy | - |
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| vicegerent | (noun) someone appointed by a ruler as an administrative deputy | - |
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| viewpoint | (noun) a mental position from which things are viewed | Synonyms: point of view, stand, standpoint |
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| (noun) a place from which something can be viewed | Synonyms: vantage point |
| viscount | (noun) a British peer who ranks below an earl and above a baron | - |
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| (noun) (in various countries) a son or younger brother or a count | - |
| visitant | (noun) someone who visits | Synonyms: visitor |
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| voiceprint | (noun) biometric identification by electronically recording and graphically representing a person's voice | - |
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| want | (noun) a specific feeling of desire | Synonyms: wish, wishing |
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| (noun) anything that is necessary but lacking | Synonyms: need |
| (noun) a state of extreme poverty | Synonyms: deprivation, neediness, privation |
| (noun) the state of needing something that is absent or unavailable | Synonyms: deficiency, lack |
| warrant | (noun) a writ from a court commanding police to perform specified acts | - |
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| (noun) a written assurance that some product or service will be provided or will meet certain specifications | Synonyms: guarantee, warrantee, warranty |
| (noun) formal and explicit approval | Synonyms: countenance, endorsement, imprimatur, indorsement, sanction |
| (noun) a type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price | Synonyms: stock-purchase warrant, stock warrant |
| waterfront | (noun) the area of a city (such as a harbor or dockyard) alongside a body of water | - |
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| wavefront | (noun) (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium | Synonyms: wave front |
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| weldment | (noun) an assembly of parts welded together | - |
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| wellpoint | (noun) a perforated tube driven into the ground to collect water from the surrounding area | Synonyms: well point |
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| wisent | (noun) European bison having a smaller and higher head than the North American bison | Synonyms: aurochs, Bison bonasus |
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| wonderment | (noun) the feeling aroused by something strange and surprising | Synonyms: admiration, wonder |
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| wont | (noun) an established custom | Synonyms: habit |
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| worriment | (noun) a difficulty that causes anxiety | Synonyms: inconvenience, troublesomeness |
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| xenotransplant | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplantation |
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