/ Dictionary / Index A alliaceous: Meaning and Definition of Find definitions for: al•li•a•ceous Pronunciation: (al"ē-ā'shus), [key] — adj. belonging to the genus Allium (formerly the family Alliaceae). Cf. allium. having the odor or taste of garlic, onion, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: alliaceous (Thesaurus) allheal alliance Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language