carboxyl group carboxylation • carboxylic · · · Info · Definitions · Synonyms · Characters · · carboxyl group · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) the univalent radical -COOH; present in and characteristic of organic acids. Synonyms: carboxyl, carboxyl group. · · Noun Definition 1 Synonyms · · · carboxyl · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 g latin small letter g U+0067 l latin small letter l U+006C o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 u latin small letter u U+0075 x latin small letter x U+0078 y latin small letter y U+0079