D defs.my
Entry 1 sense Webster, 1913

indoleacetic acid

/(ĭn"dōl)/ · in·dole·a·cet·ic ac·id · IPA
01 n. A plant hormone (C10H9NO2) recognized as the principle growth regulator in higher plants; called also heteroauxin. Abbreviated IAA. Chemi…
  1. 1.
    A plant hormone (C10H9NO2) recognized as the principle growth regulator in higher plants; called also heteroauxin. Abbreviated IAA. Chemically it is 1H-indole-3-acetic acid.(Chem., Bot.) Also: heteroauxin