American Heritage® Dictionary of the English Language, Fourth 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.
- n. chemistry any of various complex phenols extracted from the bark or galls of trees; used in tanning
GNU Webster's 1913
- adj. (Chem.) 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.
- n. any of various complex phenolic substances of plant origin; used in tanning and in medicine
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