/ Dictionary / Index S sodium propionate: Meaning and Definition of Find definitions for: so'dium pro'pionate Pronunciation: [key] — Chem. Chem. a transparent, crystalline, water-soluble powder, CHNaO, used in foodstuffs to prevent mold growth, and in medicine as a fungicide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium polysulfide sodium pump Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language