Tannin meaning

tănĭn
Frequency:
(chemistry) Tannic acid or any of its derivatives.
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Any of various water-soluble polyphenols found in plant tissues that bind proteins and promote the tanning of leather.
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Any of various other substances that promote the tanning of leather, such as chromium salts.
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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.
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Any of various compounds, including tannic acid, that occur naturally in the bark and fruit of various plants, especially the nutgalls, certain oaks, and sumac. Tannins are polyphenols, and form yellowish to light brown amorphous masses that can be powdery, flaky, or spongy. They bind proteins and are used in dyeing, in tanning leather, in clarifying wine and beer, and as an astringent in medicine. Tannins also give color and flavor to black tea.
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Any of various other substances that promote the tanning of leather, such as chromium salts.
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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