| ̷ ̷ˌ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷- noun
Etymology: indoleacetic from indole + acetic
: a crystalline plant hormone (C 8 H 6 N)CH 2 COOH present in urine, made synthetically, and used to promote growth and rooting of plants — called also beta-indolylacetic acid, 3-indoleacetic acid, heteroauxin ; see auxin