acetic anhydride acetic acid • acetification · · · Info · Definitions · Characters · · acetic anhydride · · Text Common · · Latin · · Scripts 16 · · Length 6 · · Syllables Definitions · · · (noun) a compound that is needed in order to refine opium into heroin. Synonyms: acetic anhydride. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079