/ Dictionary / Index D diammonium phosphate: Meaning and Definition of Find definitions for: di'am•mo'ni•um phos'phate Pronunciation: (dī'u-mō'nē-um, dī"-), [key] — Chem. Chem. a white, crystalline, water-soluble compound, (NH)HPO, used as fertilizer, in fire extinguishers, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diamine diamond Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language