from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A form of tannic acid extracted from acorns and oak-bark.

from The Century Dictionary and Cyclopedia

  • n. A crystalline monosaccharide, C6H12O6, occurring in oak-bark. It is obtained from the mother-liquors of quercite. It is optically inactive and melts at 340° C.
  • n. A variety of tannic acid, C15H12O9 + 2H2O, found in oak-bark. It is a light-brown hygroscopic powder. Also called quercic acid.
  • n. A bitter crystalline compound found in oak-bark.


Sorry, no etymologies found.


  • The active ingredients are quercin, a natural aspirin and tannin, a natural astringent and important ingredient in tea.

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