| thalamocortical | (adjective) relating to or connecting the cortex and thalamus | - |
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| thalamus | (noun) large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon | - |
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| thalassaemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassemia |
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| thalassemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassaemia |
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| thalassic | (adjective) relating to the seas, especially smaller or inland seas | - |
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| thalidomide | (noun) a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis | - |
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| thallium | (noun) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores | Synonyms: atomic number 81, Tl |
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| thalloid | (adjective) of or relating to or resembling or consisting of a thallus | - |
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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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| thallophytic | (adjective) pertaining to or characteristic of thallophytes | - |
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| thallus | (noun) a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes | - |
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| thalmencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, interbrain |
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| thalweg | (noun) a line following the lowest points of a valley | - |
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| (noun) the middle of the chief navigable channel of a waterway that forms the boundary line between states | - |
| thanatology | (noun) the branch of science that studies death (especially its social and psychological aspects) | - |
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| thanatophobia | (noun) a morbid fear of death | - |
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| thanatopsis | (noun) an essay expressing a view on the subject of death | - |
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| thane | (noun) a man ranking above an ordinary freeman and below a noble in Anglo-Saxon England (especially one who gave military service in exchange for land) | - |
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| (noun) a feudal lord or baron | - |
| thaneship | (noun) the position of thane | - |
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| thank | (verb) express gratitude or show appreciation to | Synonyms: give thanks |
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| thankful | (adjective) feeling or showing gratitude | Synonyms: grateful |
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| thankfully | (adverb) let us be thankful that | - |
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| (adverb) in a thankful manner; with thanks | Synonyms: gratefully |
| thankfulness | (noun) warm friendly feelings of gratitude | Synonyms: appreciativeness, gratefulness |
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| thankless | (adjective) not feeling or showing gratitude | Synonyms: ungrateful, unthankful |
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| (adjective) not likely to be rewarded | Synonyms: unappreciated, ungratifying |
| thanks | (noun) with the help of or owing to | - |
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| (noun) an acknowledgment of appreciation | - |
| thanksgiving | (noun) a short prayer of thanks before a meal | Synonyms: blessing, grace |
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| thatch | (noun) a house roof made with a plant material (as straw) | Synonyms: thatched roof |
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| (noun) hair resembling thatched roofing material | - |
| (noun) plant stalks used as roofing material | - |
| (verb) cover with thatch | - |
| thatcher | (noun) someone skilled in making a roof from plant stalks or foliage | - |
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| thaumatolatry | (noun) the worship of miracles | Synonyms: miracle-worship |
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| thaumaturge | (noun) one who practices magic or sorcery | Synonyms: magician, necromancer, sorcerer, thaumaturgist, wizard |
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| thaumaturgist | (noun) one who practices magic or sorcery | Synonyms: magician, necromancer, sorcerer, thaumaturge, wizard |
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| thaumaturgy | (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, deception, illusion, legerdemain, magic, magic trick, trick |
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| (noun) any art that invokes supernatural powers | Synonyms: magic |
| thaw | (noun) a relaxation or slackening of tensions or reserve; becoming less hostile | - |
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| (noun) warm weather following a freeze; snow and ice melt | Synonyms: thawing, warming |
| (noun) the process whereby heat changes something from a solid to a liquid | Synonyms: melt, melting, thawing |
| (verb) become or cause to become soft or liquid | Synonyms: dethaw, dissolve, melt, unfreeze, unthaw |
| thawed | (adjective) no longer frozen solid | - |
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| (adjective) no longer frozen | - |
| thawing | (noun) warm weather following a freeze; snow and ice melt | Synonyms: thaw, warming |
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| (noun) the process whereby heat changes something from a solid to a liquid | Synonyms: melt, melting, thaw |