Caffetannic

Caf`fe`tan´nic


a.1.(Chem.) Pertaining to, or derived from, the tannin of coffee.
Caffetannic acid
a variety of tannin obtained from coffee berries, regarded as a glucoside.
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It passes the water over coffee grinds again and again, and allows the coffee to boil, releasing caffetannic acid, which gives coffee a bitter taste.