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.
-- “It hath beene of later experience found also to be effectual against the falling sicknesse, that divers have been cured thereby; for after the taking of the _Decoct.manipulor. ii.c. polypod.quercin. contus. ℥ iv. in cerevisia_, they that have been troubled with it twenty-six years, and have fallen once in a weeke, or two or three times in a moneth, have not fallen once in fourteen or fifteen moneths, that is until the writing hereof.”