| 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| thalidomide | (noun) a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis | - |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 | - |
| therewithal | (adverb) together with all that; besides | - |
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| triumphal | (adjective) relating to or celebrating a triumph | - |
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| (adjective) joyful and proud especially because of triumph or success | Synonyms: exultant, exulting, jubilant, prideful, rejoicing, triumphant |
| unchallengeable | (adjective) not open to challenge | - |
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| unchallenged | (adjective) generally agreed upon; not subject to dispute | Synonyms: undisputed, unquestioned |
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| unhallow | (verb) remove the consecration from a person or an object | Synonyms: deconsecrate, desecrate |
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| unhallowed | (adjective) not hallowed or consecrated | Synonyms: unholy |
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| whale | (noun) any of the larger cetacean mammals having a streamlined body and breathing through a blowhole on the head | - |
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| (noun) a very large person; impressive in size or qualities | Synonyms: giant, heavyweight, hulk |
| (verb) hunt for whales | - |
| whaleboat | (noun) a long narrow boat designed for quick turning and use in rough seas | - |
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| whalebone | (noun) a horny material from the upper jaws of certain whales; used as the ribs of fans or as stays in corsets | Synonyms: baleen |
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| whaler | (noun) a ship engaged in whale fishing | Synonyms: whaling ship |
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| (noun) a seaman who works on a ship that hunts whales | - |
| whalesucker | (noun) large blue Pacific remora that attaches to whales and dolphins | Synonyms: Remilegia australis, whale sucker |
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| wherewithal | (noun) the necessary means (especially financial means) | - |
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| withal | (adverb) together with this | - |
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| (adverb) despite anything to the contrary (usually preceding a concession) | Synonyms: all the same, at the same time, even so, however, nevertheless, nonetheless, notwithstanding, still, yet |
| 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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| zenithal | (adjective) relating to or located at or near the zenith | - |
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