/ Dictionary / Index A ammonium phosphate: Meaning and Definition of Find definitions for: ammo'nium phos'phate Pronunciation: [key] — Chem. Chem. See (loosely) diammonium phosphate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ammonium nitrate ammonium purpurate Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language