from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A white or yellowish astringent powder, C14H10O9, derived from nutgalls and used as a denaturant and in tanning and textiles.
  • n. A lustrous yellowish to light brown amorphous, powdered, flaked, or spongy mass having the approximate composition C76H52O46, derived from the bark and fruit of many plants and used in photography, as a mordant, and to clarify wine and beer.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any of various complex phenols extracted from the bark or galls of trees; used in tanning

from the GNU version of the Collaborative International Dictionary of English

  • adj. By extension, any one of a series of astringent substances resembling tannin proper, widely diffused through the vegetable kingdom, as in oak bark, willow, catechu, tea, coffee, etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of various complex phenolic substances of plant origin; used in tanning and in medicine


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