/ Dictionary / Index P propionate: Meaning and Definition of Find definitions for: pro•pi•o•nate Pronunciation: (prō'pē-u-nāt"), [key] — n. Chem. an ester or salt of propionic acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. propionaldehyde propionibacterium 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