| thunk | (noun) a dull hollow sound | - |
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| thurible | (noun) a container for burning incense (especially one that is swung on a chain in a religious ritual) | Synonyms: censer |
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| thurifer | (noun) an acolyte who carries a thurible | - |
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| thus | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, olibanum |
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| thwack | (noun) a hard blow with a flat object | - |
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| thwart | (noun) a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat | Synonyms: cross thwart |
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| thwarter | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, obstructor, resister |
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| thwarting | (noun) an act of hindering someone's plans or efforts | Synonyms: foiling, frustration |
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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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