| tineoid | (noun) small dull-colored moth with chewing mouthparts | Synonyms: tineoid moth |
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| toad | (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, batrachian, frog, salientian, toad frog |
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| tod | (noun) a unit of weight for wool equal to about 28 pounds | - |
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| toehold | (noun) a wrestling hold in which the toe is held and the leg is twisted against the joints | - |
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| (noun) a small foothold used in climbing | - |
| (noun) a relatively insignificant position from which future progress might be made | - |
| toolshed | (noun) a shed for storing tools | Synonyms: toolhouse |
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| toroid | (noun) a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle | Synonyms: torus |
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| (noun) the doughnut-shaped object enclosed by a torus | - |
| tortricid | (noun) any of numerous small moths having lightly fringed wings; larvae are leaf rollers or live in fruits and galls | Synonyms: tortricid moth |
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| touchwood | (noun) material for starting a fire | Synonyms: kindling, punk, spunk, tinder |
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| towhead | (noun) a person with light blond hair | - |
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| toxoid | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: anatoxin |
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| tracheid | (noun) long tubular cell peculiar to xylem | - |
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| trad | (noun) traditional jazz as revived in the 1950s | - |
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| trailhead | (noun) the beginning of a trail | Synonyms: trail head |
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| trainband | (noun) a company of militia in England or America from the 16th century to the 18th century | - |
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| trainload | (noun) quantity that can be carried by a train | - |
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| transgendered | (noun) a person who has undergone a sex change operation | Synonyms: transexual, transsexual |
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| trapezoid | (noun) the wrist bone between the trapezium and the capitate bones | Synonyms: os trapezoideum, trapezoid bone |
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| (noun) a quadrilateral with two parallel sides | - |
| tread | (noun) a step in walking or running | Synonyms: pace, stride |
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| (noun) structural member consisting of the horizontal part of a stair or step | - |
| (noun) the part (as of a wheel or shoe) that makes contact with the ground | - |
| (noun) the grooved surface of a pneumatic tire | - |
| trend | (noun) a general tendency to change (as of opinion) | Synonyms: drift, movement |
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| (noun) the popular taste at a given time | Synonyms: style, vogue |
| (noun) general line of orientation | Synonyms: course |
| (noun) a general direction in which something tends to move | Synonyms: tendency |
| triad | (noun) a three-note major or minor chord; a note and its third and fifth tones | Synonyms: common chord |
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| (noun) three people considered as a unit | Synonyms: threesome, trinity, trio |
| (noun) a set of three similar things considered as a unit | Synonyms: trio, triple, triplet |
| (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, trine, trinity, trio, triplet, troika |
| trichomonad | (noun) cause of trichomoniasis in women and cattle and birds | - |
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| tripod | (noun) a three-legged rack used for support | - |
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| trombiculid | (noun) mite that as nymph and adult feeds on early stages of small arthropods but whose larvae are parasitic on terrestrial vertebrates | - |
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| trombidiid | (noun) mite that in all stages feeds on other arthropods | - |
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| tropicbird | (noun) mostly white web-footed tropical seabird often found far from land | Synonyms: boatswain bird, tropic bird |
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| trumpetwood | (noun) tropical American tree with large peltate leaves and hollow stems | Synonyms: Cecropia peltata, imbauba, snake wood, trumpet-wood, trumpet tree |
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| tulipwood | (noun) light easily worked wood of a tulip tree; used for furniture and veneer | Synonyms: true tulipwood, white poplar, whitewood, yellow poplar |
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| (noun) the variegated or showily striped ornamental wood of various tulipwood trees | - |
| tumbleweed | (noun) any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass | - |
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| (noun) bushy annual weed of central North America having greenish flowers and winged seeds | Synonyms: Cycloloma atriplicifolium, winged pigweed |
| (noun) bushy plant of western United States | Synonyms: Amaranthus albus, Amaranthus graecizans |
| (noun) prickly bushy Eurasian plant; a troublesome weed in central and western United States | Synonyms: Russian cactus, Russian thistle, Russian tumbleweed, Salsola kali tenuifolia |
| turd | (noun) obscene terms for feces | Synonyms: crap, dirt, poop, shit, shite |
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| turnaround | (noun) turning in the opposite direction | Synonyms: reversal, reverse, reversion, turnabout |
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| (noun) act or process of unloading and loading and servicing a vessel or aircraft for a return trip | Synonyms: turnround |
| (noun) an area sufficiently large for a vehicle to turn around | - |
| (noun) a decision to reverse an earlier decision | Synonyms: change of mind, flip-flop, reversal, turnabout |
| (noun) time need to prepare a vessel or ship for a return trip | Synonyms: turnaround time |
| turnround | (noun) act or process of unloading and loading and servicing a vessel or aircraft for a return trip | Synonyms: turnaround |
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| turtlehead | (noun) showy perennial of marshlands of eastern and central North America having waxy lanceolate leaves and flower with lower part creamy white and upper parts pale pink to deep purple | Synonyms: Chelone glabra, shell-flower, shellflower, snake-head, snakehead |
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| tweed | (noun) thick woolen fabric used for clothing; originated in Scotland | - |
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| (noun) (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth | Synonyms: flannel, gabardine, white |
| twistwood | (noun) vigorous deciduous European treelike shrub common along waysides; red berries turn black | Synonyms: twist wood, Viburnum lantana, wayfaring tree |
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| typhoid | (noun) serious infection marked by intestinal inflammation and ulceration; caused by Salmonella typhosa ingested with food or water | Synonyms: enteric fever, typhoid fever |
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| tyrannid | (noun) a passerine bird of the suborder Tyranni | - |
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| ultrasound | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, sonography, ultrasonography |
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| (noun) very high frequency sound; used in ultrasonography | - |
| unabridged | (noun) a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary | Synonyms: unabridged dictionary |
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| unconfessed | (noun) people who have not confessed | - |
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| undergrad | (noun) a university student who has not yet received a first degree | Synonyms: undergraduate |
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| underground | (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: metro, subway, subway system, tube |
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| (noun) a secret group organized to overthrow a government or occupation force | Synonyms: resistance |
| underwood | (noun) the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest | Synonyms: underbrush, undergrowth |
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| underworld | (noun) (religion) the world of the dead | Synonyms: Hades, Hell, infernal region, netherworld, Scheol |
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| (noun) the criminal class | - |
| unemployed | (noun) people who are involuntarily out of work (considered as a group) | Synonyms: unemployed people |
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| unitard | (noun) a tight-fitting garment of stretchy material that covers the body from the shoulders to the thighs (and may have long sleeves or legs reaching down to the ankles); worn by ballet dancers and acrobats for practice or performance | Synonyms: body suit, cat suit, leotard |
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| unlikelihood | (noun) the improbability of a specified outcome | Synonyms: unlikeliness |
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| upland | (noun) elevated (e.g., mountainous) land | Synonyms: highland |
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| urochord | (noun) a notochord of a larval tunicate typically confined to the caudal region | - |
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| (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochordate |
| vagabond | (noun) anything that resembles a vagabond in having no fixed place | - |
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| (noun) a wanderer who has no established residence or visible means of support | Synonyms: clochard, drifter, floater, vagrant |
| vanguard | (noun) the position of greatest importance or advancement; the leading position in any movement or field | Synonyms: cutting edge, forefront |
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| (noun) the leading units moving at the head of an army | Synonyms: van |
| (noun) any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts) | Synonyms: avant-garde, new wave, van |
| veld | (noun) elevated open grassland in southern Africa | Synonyms: veldt |
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| velvetweed | (noun) tall annual herb or subshrub of tropical Asia having velvety leaves and yellow flowers and yielding a strong fiber; naturalized in southeastern Europe and United States | Synonyms: Abutilon theophrasti, butter-print, China jute, Indian mallow, velvet-leaf, velvetleaf |
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| vespertilionid | (noun) a variety of carnivorous bat | Synonyms: vespertilian bat |
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| vespid | (noun) mostly social nest-building wasps | Synonyms: vespid wasp |
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| viand | (noun) a choice or delicious dish | - |
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| vinegarweed | (noun) aromatic plant of western United States | Synonyms: camphorweed, Trichostema lanceolatum, turpentine camphor weed |
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| vineyard | (noun) a farm of grapevines where wine grapes are produced | Synonyms: vinery |
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| viroid | (noun) the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat | Synonyms: virusoid |
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| virusoid | (noun) the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat | Synonyms: viroid |
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| void | (noun) an empty area or space | Synonyms: emptiness, vacancy, vacuum |
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| (noun) the state of nonexistence | Synonyms: nihility, nothingness, nullity |
| wad | (noun) a wad of something chewable as tobacco | Synonyms: chaw, chew, cud, plug, quid |
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| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum |
| (noun) a small mass of soft material | - |
| waistband | (noun) a band of material around the waist that strengthens a skirt or trousers | Synonyms: cincture, girdle, sash, waistcloth |
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| wakeboard | (noun) a buoyant board (resembling a surfboard) that is used to ride over water while being pulled behind a motorboat | Synonyms: wake board |
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| wallboard | (noun) a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses | Synonyms: dry wall, drywall |
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| wand | (noun) a rod used by a magician or water diviner | - |
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| (noun) a thin tapered rod used by a conductor to lead an orchestra or choir | Synonyms: baton |
| (noun) a ceremonial or emblematic staff | Synonyms: scepter, sceptre, verge |
| (noun) a thin supple twig or rod | - |
| ward | (noun) block forming a division of a hospital (or a suite of rooms) shared by patients who need a similar kind of care | Synonyms: hospital ward |
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| (noun) a division of a prison (usually consisting of several cells) | Synonyms: cellblock |
| (noun) a district into which a city or town is divided for the purpose of administration and elections | - |
| (noun) a person who is under the protection or in the custody of another | - |
| warhead | (noun) the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents | Synonyms: load, payload |
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| warlord | (noun) supreme military leader exercising civil power in a region especially one accountable to nobody when the central government is weak | - |
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| wartweed | (noun) not unattractive European weed whose flowers turn toward the sun | Synonyms: devil's milk, Euphorbia helioscopia, sun spurge, wartwort |
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| washboard | (noun) protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side | Synonyms: splashboard |
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| (noun) device consisting of a corrugated surface to scrub clothes on | - |
| washstand | (noun) furniture consisting of a table or stand to hold a basin and pitcher of water for washing: `wash-hand stand' is a British term | Synonyms: wash-hand stand |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: basin, lavatory, washbasin, washbowl |
| wasteland | (noun) an uninhabited wilderness that is worthless for cultivation | Synonyms: barren, waste |
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| wasteyard | (noun) a piece of land where waste materials are dumped | Synonyms: dump, dumpsite, garbage dump, rubbish dump, trash dump, waste-yard |
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| watchband | (noun) a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist | Synonyms: bracelet, watch bracelet, watchstrap, wristband |
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| watchword | (noun) a secret word or phrase known only to a restricted group | Synonyms: countersign, parole, password, word |
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| (noun) a slogan used to rally support for a cause | Synonyms: battle cry, cry, rallying cry, war cry |
| waterbird | (noun) freshwater aquatic bird | Synonyms: water bird, waterfowl |
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| watershed | (noun) an event marking a unique or important historical change of course or one on which important developments depend | Synonyms: landmark, turning point |
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| (noun) a ridge of land that separates two adjacent river systems | Synonyms: divide, water parting |
| (noun) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | Synonyms: basin, catchment area, catchment basin, drainage area, drainage basin, river basin |
| waterweed | (noun) a weedy aquatic plant of genus Elodea | - |
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| waveband | (noun) a band of adjacent radio frequencies (e.g., assigned for transmitting radio or television signals) | Synonyms: frequency band |
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| weald | (noun) an area of open or forested country | - |
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| weatherboard | (noun) the side toward the wind | Synonyms: weather side, windward side |
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| (noun) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below | Synonyms: clapboard, weatherboarding |
| weaverbird | (noun) finch-like African and Asian colonial birds noted for their elaborately woven nests | Synonyms: weaver, weaver finch |
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| weed | (noun) street names for marijuana | Synonyms: dope, gage, grass, green goddess, locoweed, Mary Jane, pot, sens, sess, skunk, smoke |
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| (noun) a black band worn by a man (on the arm or hat) as a sign of mourning | Synonyms: mourning band |
| (noun) any plant that crowds out cultivated plants | - |
| weekend | (noun) a time period usually extending from Friday night through Sunday; more loosely defined as any period of successive days including one and only one Sunday | - |
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| weld | (noun) a metal joint formed by softening with heat and fusing or hammering together | - |
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| (noun) European mignonette cultivated as a source of yellow dye; naturalized in North America | Synonyms: dyer's mignonette, dyer's rocket, Reseda luteola |
| wellhead | (noun) a structure built over a well | - |
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| (noun) the source of water for a well | Synonyms: wellspring |
| westward | (noun) the cardinal compass point that is at 270 degrees | Synonyms: due west, W, west |
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| wetland | (noun) a low area where the land is saturated with water | - |
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| wheatfield | (noun) a field planted with wheat | Synonyms: wheat field |
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| whipcord | (noun) a strong worsted or cotton fabric with a diagonal rib | - |
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| (noun) closely twisted hard cord used for the lashes of whips | - |
| whirlwind | (noun) a more or less vertical column of air whirling around itself as it moves over the surface of the Earth | - |
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| whirlybird | (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: chopper, eggbeater, helicopter |
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| whitehead | (noun) a small whitish lump in the skin due to a clogged sebaceous gland | Synonyms: milium |
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| whitewood | (noun) light easily worked wood of a tulip tree; used for furniture and veneer | Synonyms: true tulipwood, tulipwood, white poplar, yellow poplar |
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| widowhood | (noun) the state of being a widow who has not remarried | - |
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| (noun) the time of a woman's life when she is a widow | - |
| wild | (noun) a wild and uninhabited area left in its natural condition | Synonyms: wilderness |
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| (noun) a wild primitive state untouched by civilization | Synonyms: natural state, state of nature |
| wind | (noun) breath | - |
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| (noun) a reflex that expels intestinal gas through the anus | Synonyms: breaking wind, fart, farting, flatus |
| (noun) a musical instrument in which the sound is produced by an enclosed column of air that is moved by bellows or the human breath | Synonyms: wind instrument |
| (noun) an indication of potential opportunity | Synonyms: confidential information, hint, lead, steer, tip |
| (noun) empty rhetoric or insincere or exaggerated talk | Synonyms: idle words, jazz, malarkey, malarky, nothingness |
| (noun) air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure | Synonyms: air current, current of air |
| (noun) a tendency or force that influences events | - |
| (noun) the act of winding or twisting | Synonyms: twist, winding |
| windshield | (noun) transparent screen (as of glass) to protect occupants of a vehicle | Synonyms: windscreen |
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| windward | (noun) the side of something that is toward the wind | - |
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| (noun) the direction from which the wind is coming | - |
| wingspread | (noun) distance between the tips of the wings (as of a bird or insect) when fully extended | - |
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| (noun) linear distance between the extremities of an airfoil | Synonyms: wingspan |