| tachymeter | (noun) a theodolite designed for rapid measurements | Synonyms: tacheometer |
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| tauromachy | (noun) the activity at a bullfight | Synonyms: bullfighting |
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| telegraphy | (noun) apparatus used to communicate at a distance over a wire (usually in Morse code) | Synonyms: telegraph |
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| (noun) communicating at a distance by electric transmission over wire | - |
| telepathy | (noun) apparent communication from one mind to another without using sensory perceptions | Synonyms: thought transference |
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| telephotography | (noun) photography using a telephoto lens | - |
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| (noun) transmission and reproduction of photographs and charts and pictures over a distance | - |
| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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| tetrahydrocannabinol | (noun) psychoactive substance present in marijuana | Synonyms: THC |
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| tetrahymena | (noun) relative of the paramecium; often used in genetics research | - |
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| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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| thallophyte | (noun) any of a group of cryptogamic organisms consisting principally of a thallus and thus showing no differentiation into stem and root and leaf | - |
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| theophylline | (noun) a colorless crystalline alkaloid derived from tea leaves or made synthetically; used in medicine as a bronchial dilator | Synonyms: Elixophyllin, Slo-Bid, Theobid |
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| theosophy | (noun) a system of belief based on mystical insight into the nature of God and the soul | - |
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| thermography | (noun) diagnostic technique using a thermograph to record the heat produced by different parts of the body; used to study blood flow and to detect tumors | - |
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| thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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| thylacine | (noun) rare doglike carnivorous marsupial of Tasmania having stripes on its back; probably extinct | Synonyms: Tasmanian tiger, Tasmanian wolf, Thylacinus cynocephalus |
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| thyme | (noun) leaves can be used as seasoning for almost any meat and stews and stuffings and vegetables | - |
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| (noun) any of various mints of the genus Thymus | - |
| thymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: deoxythymidine |
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| thymine | (noun) a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine | Synonyms: T |
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| thymol | (noun) a colorless crystalline solid used in perfume or preserving biological specimens or in embalming or medically as a fungicide or antiseptic | Synonyms: thyme camphor, thymic acid |
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| thymosin | (noun) hormone secreted by the thymus; stimulates immunological activity of lymphoid tissue | - |
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| thymus | (noun) a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age | Synonyms: thymus gland |
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| thyreophoran | (noun) armored dinosaurs: stegosaurs and ankylosaurs | Synonyms: suborder Thyreophora, Thyreophora |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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| thyroglobulin | (noun) an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins | - |
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| thyroid | (noun) located near the base of the neck | Synonyms: thyroid gland |
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| thyroidectomy | (noun) surgical removal of the thyroid gland | - |
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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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| thyromegaly | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, struma |
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| thyronine | (noun) a phenolic amino acid of which thyroxine is a derivative | - |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| thyroxin | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxine |
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| thyroxine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxin |
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| thyrse | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrsus |
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| thyrsopteris | (noun) a terrestrial tree fern of South America | Synonyms: Thyrsopteris elegans |
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| thyrsus | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrse |
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| thysanopter | (noun) an insect of the order Thysanoptera | Synonyms: thysanopteron, thysanopterous insect |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| thysanuron | (noun) primitive wingless insects: bristletail | Synonyms: thysanuran insect |
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| timothy | (noun) a grass grown for hay | - |
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| (noun) grass with long cylindrical spikes grown in northern United States and Europe for hay | Synonyms: herd's grass, Phleum pratense |
| tomography | (noun) (medicine) obtaining pictures of the interior of the body | Synonyms: imaging |
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| topography | (noun) the configuration of a surface and the relations among its man-made and natural features | - |
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| (noun) precise detailed study of the surface features of a region | - |
| tracheophyte | (noun) green plant having a vascular system: ferns, gymnosperms, angiosperms | Synonyms: vascular plant |
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| trichloroethylene | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethane |
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| triiodothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: liothyronine, T |
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| trophy | (noun) something given as a token of victory | Synonyms: prize |
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| (noun) an award for success in war or hunting | - |
| typography | (noun) the craft of composing type and printing from it | - |
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| (noun) art and technique of printing with movable type | Synonyms: composition |
| ultrasonography | (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, ultrasound |
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| uropathy | (noun) any pathology of the urinary tract | - |
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| venography | (noun) roentgenographic examination of veins | - |
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| vichyssoise | (noun) a creamy potato soup flavored with leeks and onions; usually served cold | - |
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| why | (noun) the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores' | Synonyms: wherefore |
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| whydah | (noun) mostly black African weaverbird | Synonyms: whidah, widow bird |
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| withy | (noun) strong flexible twig | Synonyms: withe |
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| worthy | (noun) an important, honorable person (word is often used humorously) | - |
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| xanthophyl | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyll |
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| xanthophyll | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyl |
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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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| 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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| zephyr | (noun) a slight wind (usually refreshing) | Synonyms: air, breeze, gentle wind |
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| zoophyte | (noun) any of various invertebrate animals resembling a plant such as a sea anemone or coral or sponge | - |
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