indolebutyric acid indoleacetic acid • indolence · · · Info · Definitions · Characters · · indolebutyric acid · · Text Common · · Latin · · Scripts 18 · · Length 8 · · Syllables Definitions · · · (noun) a synthetic plant hormone promoting elongation of stems and roots. Synonyms: indolebutyric acid. · · Noun Definition 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 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F 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