The Collaborative International Dictionary
indoleacetic acid
indoleacetic acid \in"dole*a*cet"ic ac"id\ ([i^]n"d[=o]l), n. (Chem., Bot.) 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.
Wiktionary
indoleacetic acid
n. (context organic compound English) an auxin plant hormone, synthesized in leaves, that stimulates growth, especially in the presence of ethylene
WordNet
indoleacetic acid
n. a plant hormone promoting elongation of stems and roots [syn: IAA]
Usage examples of "indoleacetic acid".
Many synthetic compounds have been shown to have auxin activity and are commercially available, such as napthaleneacetic acid (NAA), indolebutyric acid (IBA), and 2,4-dichlorophenoxyacetic acid (2,4 DPA), but only indoleacetic acid has been isolated from plants.