What is pertaining to, or derived from, the tannin of coffee. Caffetannic acid, a variety of tannin obtained from coffee berries, regarded as a glucoside called?

caffetannic — Pertaining to, or derived from, the tannin of coffee. Caffetannic acid, a variety of tannin obtained from coffee berries, regarded as a glucoside. (Webster's 1913.)

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