Wiktionary
abscisic acid
n. (context biochemistry English) A terpenoid best known as a plant hormone that inhibits seed germination and was once thought to be important in abscission.
Wikipedia
Abscisic acid
Abscisic acid (ABA), also known as abscisin II and dormin, is best known as a plant hormone. ABA functions in many plant developmental processes, including bud dormancy. It is degraded by the enzyme (+)-abscisic acid 8'-hydroxylase into phaseic acid.
Usage examples of "abscisic acid".
In the second stage, growth ceased, carbohydrates translocated to the roots, and amounts of abscisic acid grew in some leaves until they fell off.