/ Dictionary / Index P propanoic acid: Meaning and Definition of Find definitions for: pro'pa•no'ic ac'id Pronunciation: (prō'pu-nō'ik, prō"-), [key] — Chem. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. propanil propantheline bromide Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language