What is "jasmonic acid"

n. (context organic compound English) An oxylipin lipid, containing a cyclopentanone ring, related to the prostaglandins; its esters, the jasmonates, are responsible for the smell of jasmine and act as plant hormones

Jasmonic acid (JA) is an organic compound found in several plants. The molecule is a member of the jasmonate class of plant hormones. It is biosynthesized from linolenic acid by the octadecanoid pathway.