quaternary ammonium compound quaternary • quaternary period · · · Info · Definitions · Characters · · quaternary ammonium compound · · Text Common · · Latin · · Scripts 28 · · Length 11 · · Syllables Definitions · · · (noun) a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface-active agents, disinfectants, and in drugs. Synonyms: quaternary ammonium compound. · · 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 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 q latin small letter q U+0071 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079