Word Study
indoleacetic acid
CIDE DICTIONARY
indoleacetic acid, n.
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 . [PJC]
OXFORD DICTIONARY
indoleacetic acid, n. Biochem. any of the several isomeric acetic acid derivatives of indole, esp. one found as a natural growth hormone in plants.
Usage
Abbr.: IAA.
Etymology
INDOLE + ACETIC
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