/ Dictionary / Index A ammonium cyanate: Meaning and Definition of Find definitions for: ammo'nium cy'anate Pronunciation: [key] — Chem. Chem. a white, crystalline solid, CHNO, soluble in alcohol, that is converted into urea when heated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ammonium chromic sulfate ammonium hydroxide Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language