英语释义
1
n. The concrete essence of the tonka bean, the fruit of
2
Dipterix (formerly Coumarouna) odorata and consisting essentially of
3
coumarin proper, which is a white crystalline substance, C9H6O2, of
4
vanilla-like odor, regarded as an anhydride of coumaric acid, and used
5
in flavoring. Coumarin in also made artificially.