What is "ursolic acid"

n. (context organic compound English) a pentacyclic triterpenoid carboxylic acid found in many plants; an isomer of oleanolic acid

Ursolic acid (sometimes referred to as urson, prunol, malol, or 3-beta-3-hydroxy-urs-12-ene-28-oic-acid), is a pentacyclic triterpenoid identified in the epicuticular waxes of apples as early as 1920 and widely found in the peels of fruits, as well as in herbs and spices like rosemary and thyme.