Definition of tannin noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈtænɪn//
; NAmE NAmE//ˈtænɪn//
(also tannic acid) [uncountable]
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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 Word Originearly 19th cent.: from French tanin, from tan ‘tanbark’ (ultimately related to tan) + -in.
See the Oxford Advanced American Dictionary entry: tannin