valproic acidEnglishOxford Dictionary of Englishvalproic acid /valˈprəʊɪk / ▸ noun [mass noun] Chemistry a synthetic crystalline compound with anticonvulsant properties, used (generally as salts) in the treatment of epilepsy. Alternative name: 2-propylpentanoic acid; chemical formula: C7H15COOH. – ORIGIN 1970s: valproic from valeric (see valeric acid) + pro(pyl) + -ic.