Question

why absisic acid is called as inhibitry acid​

Answer 1

It is because absisic acid inhibits the growth in plants to a certain limit.

for example -wilting of leaves.

Answer 2

Abscisic acid is sometimes considered to be a plant stress hormone because it is synthesized in response to many kinds of stress, including cold, salt, and water stress. Abscisic acid can inhibit or reverse the actions of other growth-promoting hormones.