/ Dictionary / Index A ammoniacal: Meaning and Definition of Find definitions for: am•mo•ni•a•cal Pronunciation: (am"u-nī'u-kul), [key] — adj. consisting of, containing, or using ammonia. like ammonia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ammoniacal (Thesaurus) ammoniac ammonia liquor Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language