Coumarin
Pronunciation : Cou"ma*rin (k"m-rn)
Part of Speech : n.
Etymology : [F., fr. coumarou, a tree of Guiana.] (Chem.)
Definition : Defn: The concrete essence of the tonka bean, the fruit of Dipterix (formerly Coumarouna) odorata and consisting essentially of coumarin proper, which is a white crystalline substance, C9H6O2, of vanilla- like odor, regarded as an anhydride of coumaric acid, and used in flavoring. Coumarin in also made artificially.
Source : Webster's Unabridged Dictionary, 1913