indoleacetic acid

noun Biochemistry.

1. a crystalline, water-insoluble powder, C10H9NO2, a natural plant hormone, used especially for stimulating growth and root formation in plant cutting.

noun

1. an auxin that causes elongation of the cells of plant stems. Formula: C 10 H 9 NO 2Abbreviation: IAA

n.

1. A plant hormone that stimulates growth.