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thingummy (chiefly British; informal) something for which the precise name is unknown or has been forgotten; thingamabob.
think to use the power of the mind. [13 definitions]
thinkable suitable to be considered as a possibility; conceivable. [2 definitions]
thinker a person who thinks in a particular way. [2 definitions]
thinking characterized by rational thought; reasoning. [3 definitions]
think over to give serious thought to.
think tank (informal) an institute or center, often funded by a government or corporation, that is staffed by people who research and analyze complex problems with a view to practical applications.
think the world of to have a very high opinion of.
think up to use the mind to invent (a story, excuse, or the like).
thinner1 turpentine or other liquid used for diluting paint to the desired consistency. [2 definitions]
thinner2 comparative of thin.
thin-skinned having a thin skin. [2 definitions]
thio- sulfur.
thiopental a yellowish white powder that is administered intravenously as an anesthetic or hypnotic; thiopental sodium.
thiosulfate a salt or ester of thiosulfuric acid.
thiosulfuric acid a sulfuric acid, occurring only in solution or in its salts and esters, in which one oxygen atom has been replaced by a sulfur atom.
third indicating rank or position between second and fourth. [4 definitions]
third base in baseball, the base that is located between second base and home plate. [2 definitions]
third baseman in baseball, the player whose position is at third base when the other team is batting and whose primary function is to defend that base.
third-class of or designating the class below second class, as in railroad passenger accommodations, postal delivery, or the like. [3 definitions]
third class the class, status, or rank next below second class. [3 definitions]