/ Dictionary / Index A ammonium carbonate: Meaning and Definition of Find definitions for: ammo'nium car'bonate Pronunciation: [key] — Chem. Chem. a water-soluble mixture of ammonium bicarbonate and ammonium carbamate, occurring either as a white powder or in colorless, hard, crystalline masses: used chiefly in the manufacture of smelling salts and baking powder. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ammonium carbamate ammonium chloride Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language