Etymology
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tannin (n.)

"tannic acid, vegetable substance capable of converting animal hide to leather," 1802, from French tannin (1798), from tan "crushed oak bark containing tannin" (see tan (v.)). Tannic acid first recorded 1836, from French acide tannique, inroduced 1834 by French chemist Théophile-Jules Pelouze (1807-1867).

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Definitions of tannin

tannin (n.)
any of various complex phenolic substances of plant origin; used in tanning and in medicine;
Synonyms: tannic acid
From wordnet.princeton.edu