indoleacetic acid indole • indolebutyric acid · · · Info · Definitions · Synonyms · Characters · · indoleacetic acid · · Text Common · · Latin · · Scripts 17 · · Length 7 · · Syllables Definitions · · · (noun) a plant hormone promoting elongation of stems and roots. Synonyms: indoleacetic acid, IAA. · · Noun Definition 1 Synonyms · · · iaa · · Synonym 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 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074