Breadcrumb Home > Dictionary > Index T thiouracil: Meaning and Definition of Find definitions for: thi•o•u•ra•cil Pronunciation: (thī"ō-yoor'u-sil), [key] — n. Pharm. a white, slightly water-soluble, bitter, crystalline powder CHNOS, used chiefly in treating hyperthyroidism by reducing the activity of the thyroid gland. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thiouracil (Thesaurus) thiothixene thiourea TrendingHere are the facts and trivia that people are buzzing about. Ramadan and Eid al-Fitr 42 Best War Movie Quotes Current Events This Week: March 2023 Recycling Facts William Shakespeare Worst U.S. Forest Fires ✖ Related Content Daily Word Quiz: recreant Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language