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From: Webster's Revised Unabridged Dictionary (1913)

 Cou·mar·ic 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.
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