tannin, tannic acid(noun)
any of various complex phenolic substances of plant origin; used in tanning and in medicine
Tannic acid or any of its derivatives.
same as Tannic acid, under Tannic
A tannin is an astringent, bitter plant polyphenolic compound that binds to and precipitates proteins and various other organic compounds including amino acids and alkaloids. The term tannin refers to the use of wood tannins from oak in tanning animal hides into leather; hence the words "tan" and "tanning" for the treatment of leather. However, the term "tannin" by extension is widely applied to any large polyphenolic compound containing sufficient hydroxyls and other suitable groups to form strong complexes with various macromolecules. The tannin compounds are widely distributed in many species of plants, where they play a role in protection from predation, and perhaps also as pesticides, and in plant growth regulation. The astringency from the tannins is what causes the dry and puckery feeling in the mouth following the consumption of unripened fruit or red wine. Likewise, the destruction or modification of tannins with time plays an important role in the ripening of fruit and the aging of wine.
Chambers 20th Century Dictionary
tan′in, n. an astringent substance found largely in oak-bark or gall-nuts, of great use in tanning.—n. Tann′ate, a salt of tannic acid.—adjs. Tann′ic; Tannif′erous, yielding tannin.—n. Tan′-ride, an enclosure spread with tan for riding.—Tannic acid, an acid forming the astringent principle of the bark of oak and other trees, used in tanning and in medicine. [Fr. tannin.]
The Nuttall Encyclopedia
an astringent principle found in gallnuts and the bark chiefly of the oak.
The numerical value of tannin in Chaldean Numerology is: 3
The numerical value of tannin in Pythagorean Numerology is: 9
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