noun[mass noun] Biochemistry
A compound which is an acetic acid derivative of indole, especially one found as a natural growth hormone (auxin) in plants.
- The plant hormone auxin (indoleacetic acid) plays a role in specifying the pattern of root cells, and mutations affecting its localization lead to root defects.
- In addition, various combinations of the following hormones were also added: naphthylacetic acid, 3 - indoleacetic acid, with 6-benzylaminopurine or kinetin.
- A bacterial substance known as indoleacetic acid may play a part in sprout inhibition.
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