/ Dictionary / Index A allylthiourea: Meaning and Definition of Find definitions for: al•lyl•thi•o•u•re•a Pronunciation: (al"il-thī"ō-yoo-rē'u, -yoor'ē-u), [key] — n. Chem. thiosinamine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. allyl sulfide ALM Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language