tannin
noun /ˈtænɪn/
/ˈtænɪn/
(also tannic acid)
[uncountable]- a yellow or brown substance found in the bark of some trees and the fruit of many plants, which is present in wine and tea and used in making leather
单宁;单宁酸;鞣质 词源early 19th cent.: from French tanin, from tan ‘tanbark’ (ultimately related to tan) + -in.