/ Dictionary / Index P propionic acid: Meaning and Definition of Find definitions for: pro'pion'ic ac'id Pronunciation: [key] — Chem., Pharm. Chem.,Pharm. a colorless, oily, water-soluble liquid, CHO, having a pungent odor: used in making bread-mold-inhibiting propionates, in perfumery, and in medicine as a topical fungicide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. propionic propitiate 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