Webster’s Revised Unabridged Dictionary · 1913
Caffetannic
Caf′fe·tan′nic (kăf′fē·tăn′nĭk), a. [Caffeic + tannic.] (Chem.) Pertaining to, or derived from, the tannin of coffee.
Caffetannic acid, a variety of tannin obtained from coffee berries, regarded as a glucoside.