GNU Collaborative International Dictionary of English

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Found one definition

1.       
   indoleacetic acid (ĭnˈdōl), 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.
   
   [PJC]