The Collaborative International Dictionary
Coumaric
Coumaric \Cou*mar"ic\ (k??-m?r"?k), a. Relating to, derived from, or like, the Dipterix odorata, a tree of Guiana.
Coumaric acid (Chem.), one of a series of aromatic acids, related to cinnamic acid, the most important of which is a white crystalline substance, HO.C6H4.C2H2.CO2H, obtained from the tonka bean, sweet clover, etc., and also produced artificially.
Wiktionary
coumaric
a. Of or pertaining to coumaric acid or its derivatives