Tannin Definition

tănĭn
tannins
noun
tannins
Any of a group of naturally occurring phenolic compounds that precipitate proteins, alkaloids, and glucosides from solution, and convert hide into leather, including tannic acid: some are present in coffee and tea.
Webster's New World
Any of various other substances that promote the tanning of leather, such as chromium salts.
American Heritage

(chemistry) Tannic acid or any of its derivatives.

Wiktionary
Synonyms:

Other Word Forms of Tannin

Noun

Singular:
tannin
Plural:
tannins

Origin of Tannin

  • French from tan crushed oak bark from Old French from Medieval Latin tannum tan1

    From American Heritage Dictionary of the English Language, 5th Edition

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tannin