| switcheroo | (noun) a sudden unexpected switch | - |
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| telerobotics | (noun) the area of robotics that is concerned with the control of robots from a distance | - |
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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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| theropod | (noun) any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs | Synonyms: bird-footed dinosaur, theropod dinosaur |
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| thimerosal | (noun) a light-colored crystalline powder (trade name Merthiolate) used as a surgical antiseptic | Synonyms: Merthiolate, sodium ethylmercurithiosalicylate |
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| thunderousness | (noun) The state or condition of being very loud, suggestive of thunder; booming loudness. | - |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| tocopherol | (noun) a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body | Synonyms: E, vitamin E |
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| torero | (noun) a matador or one of the supporting team during a bull fight | - |
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| transferor | (noun) (law) someone who conveys a title or property to another | - |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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| trichopteron | (noun) caddis fly | Synonyms: trichopteran, trichopterous insect |
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| tuberose | (noun) a tuberous Mexican herb having grasslike leaves and cultivated for its spikes of highly fragrant lily-like waxy white flowers | Synonyms: Polianthes tuberosa |
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| tuberosity | (noun) a protuberance on a bone especially for attachment of a muscle or ligament | Synonyms: eminence, tubercle |
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| ureterocele | (noun) prolapse of the end of the ureter into the bladder; may obstruct urine flow | - |
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| ureterostenosis | (noun) stenosis of the ureter | - |
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| vaquero | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckaroo, buckeroo |
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| veronal | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, barbitone, diethylbarbituric acid, diethylmalonylurea |
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| veronica | (noun) any plant of the genus Veronica | Synonyms: speedwell |
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| viceroy | (noun) showy American butterfly resembling the monarch but smaller | Synonyms: Limenitis archippus |
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| (noun) governor of a country or province who rules as the representative of his or her king or sovereign | Synonyms: vicereine |
| viceroyalty | (noun) a district or province governed by a viceroy | - |
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| viceroyship | (noun) the position of viceroy | - |
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| viosterol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, cholecalciferol, D, ergocalciferol, vitamin D |
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| xeroderma | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xerodermia |
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| xerodermia | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xeroderma |
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| xerography | (noun) forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas | - |
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| xeroma | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xerophthalmia, xerophthalmus |
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| xerophile | (noun) plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte | Synonyms: desert plant, xerophilous plant, xerophyte, xerophytic plant |
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| xerophthalmia | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmus |
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| xerophthalmus | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmia |
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| xerophyte | (noun) plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte | Synonyms: desert plant, xerophile, xerophilous plant, xerophytic plant |
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| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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| xerostomia | (noun) abnormal dryness of the mouth resulting from decreased secretion of saliva | Synonyms: dry mouth |
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| xerotes | (noun) the condition of not containing or being covered by a liquid (especially water) | Synonyms: dryness, waterlessness |
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| xerox | (noun) a copy made by a xerographic copier | Synonyms: xerox copy |
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| zero | (noun) the sight setting that will cause a projectile to hit the center of the target with no wind blowing | - |
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| (noun) the point on a scale from which positive or negative numerical quantities can be measured | Synonyms: zero point |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, cypher, nought |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zilch, zip, zippo |