/ ˈtænɪn; NAmE / (also ˌtannic ˈacid ) noun
[ U ] a yellowish or brownish substance found in the bark of some trees and the fruit of many plants, used especially in making leather, ink and wine
► tan·nic / ˈtænɪk; NAmE / adjective
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WORD ORIGIN
early 19th cent.: from French tanin , from tan tanbark (ultimately related to tan ) + -in .