Definition of tannin noun from the Oxford Advanced American Dictionary

 

tannin

 noun
noun
NAmE//ˈtænən//
 
(also tannic acid)[uncountable]
 
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a yellow-brown substance found in the bark of some trees and the fruit of many plants, used especially in making leather, ink, and wine
NAmE//ˈtænɪk//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: tannin