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thorium a radioactive chemical element of the actinide series that has ninety protons in each nucleus and that occurs as a malleable, lustrous, grayish white solid metal. (symbol: Th)
thorn a short, spiny protrusion on a plant stem or branch. [3 definitions]
thorn apple any of various related plants, such as the jimson weed, that bear poisonous fruit covered with thorns. [2 definitions]
thornless combined form of thorn.
thorny covered with or full of thorns; prickly. [3 definitions]
thoron a radioactive isotope of radon produced in the disintegration of thorium.
thorough complete. [3 definitions]
thoroughbred bred from pure or unmixed stock, as a horse, dog, or other animal. [6 definitions]
thoroughfare a street that opens at both ends into other streets. [2 definitions]
thoroughgoing marked by thoroughness or completeness; very thorough. [2 definitions]
thoroughly completely; throughout.
thoroughwort boneset.
those pl. of that.
thou the person or divinity spoken to or addressed (used as nd person singular pronoun esp. in earlier literature and religious writing); you.
though in spite of the fact that. [3 definitions]
thought1 the act, process, or power of thinking. [6 definitions]
thought2 past tense and past participle of think.
thoughtful inclined to be deep in thought; contemplative. [3 definitions]
thoughtless not thinking adequately or enough; careless; reckless. [3 definitions]
thought-provoking causing or challenging one to think deeply and seriously.
thousand the number represented by the Arabic numeral 1000 and by the Roman numeral M. [4 definitions]