/ Dictionary / Index T thiourea: Meaning and Definition of Find definitions for: thi•o•u•re•a Pronunciation: (thī"ō-yoo-rē'u, -yoor'ē-u), [key] — n. Chem. a colorless, crystalline, bitter-tasting, water-soluble solid, CHNS, derived from urea by replacement of the oxygen with sulfur: used chiefly in photography, inorganic synthesis, and to accelerate the vulcanization of rubber. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thiouracil thioxanthene Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language