プロピオン酸さんMeanings1nounpropionic acid; propanoic acidchemistryA carboxylic acid with the formula C₂H₅COOH. Used as a preservative and in chemical synthesis. Technical term in chemistry.プロピオン酸さんは食しょく品ひんの保ほ存ぞん料りょうとして使つかわれることがある。Propionic acid is sometimes used as a food preservative.