Breadcrumb Home > Dictionary > Index A ammoniac: Meaning and Definition of Find definitions for: am•mo•ni•ac Pronunciation: (u-mō'nē-ak"), [key] — n. See —adj. ammoniacal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ammoniac (Thesaurus) ammonia alum ammoniacal ✖ Related Content Daily Word Quiz: ultimathule Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language