Caf‐fe″ic (?), a. [See Coffee.] (Chem.) Pertaining to, or obtained from, coffee.
Caffeic acid, an acid obtained from coffee tannin, as a yellow crystalline substance, C9H8O4.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.