DuckCorp Dico

Found 2 definitions

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   IAA \IAA\ n.
      Indoleacetic acid, a plant hormone promoting elongation of
      stems and roots. [Acronym]
      Syn: indoleacetic acid.
           [WordNet 1.5]
   
                   
                 

2.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   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.
      [PJC]