/ Dictionary / Index A ammonium salt: Meaning and Definition of Find definitions for: ammo'nium salt" Pronunciation: [key] — Chem. Chem. any salt containing the NH ion, formed by the neutralization of ammonium hydroxide by an acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ammonium purpurate ammonium selenate Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language