Tannic-acid definitions

A hydrolyzable tannin in the form of a lustrous yellowish to light brown amorphous, powdered, flaked, or spongy substance having the approximate composition C76 H52 O46 , derived from certain plants and used in tanning leather, in fixing dyes to materials, and in clarifying wine and beer.
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A yellowish, astringent substance, C14H10O9, derived from oak bark, gallnuts, etc. and used in tanning hides, in medicine, etc.
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Any of a number of similar substances.
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A lustrous, yellow-brown, amorphous substance, having the approximate chemical composition C76 H52 O46 . It is derived from the bark and fruit of many plants and is used in tanning leather, in fixing dyes to materials, and in clarifying wine and beer.
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(chemistry) Any of various complex phenols extracted from the bark or galls of trees; used in tanning.
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