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WordReference Random House Unabridged Dictionary of American English © 2024tan′nic ac′id, [Chem.]- ChemistrySee under tannin.
WordReference Random House Learner's Dictionary of American English © 2024tan•nin /ˈtænɪn/USA pronunciation n. [uncountable]- Chemistrya chemical used in tanning, found also in tea.
Also called ˈtan•nic ˈac•id. WordReference Random House Unabridged Dictionary of American English © 2024tan•nin (tan′in),USA pronunciation n. - Chemistryany of a group of astringent vegetable principles or compounds, chiefly complex glucosides of catechol and pyrogallol, as the reddish compound that gives the tanning properties to oak bark or the whitish compound that occurs in large quantities in nutgalls (common tannin, tannic acid).
- Wineany of these compounds occurring in wine and imparting an astringent taste, esp. in red wine.
- French. See tan1, -in2
- earlier tanin 1795–1805
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