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tanner's cassia
Tanner, Henry Ossawa
Tanneries
Tannery
tannia
tannic
tannic acid
tannier
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Tanning
tannish
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Tannin definitions

Webster's 1828 Dictionary

TAN'NIN, n. The chimical name of that astringent substance contained in vegetables, particularly in the bark of the oak and chestnut, and in gall-nut; the substance used to change raw hides into leather.

WordNet (r) 3.0 (2005)

n
1: any of various complex phenolic substances of plant origin; used in tanning and in medicine [syn: tannin, tannic acid]

Merriam Webster's

noun Etymology: French, from tanner to tan Date: 1802 1. any of various soluble astringent complex phenolic substances of plant origin used especially in tanning leather and dyeing fabric, manufacturing ink, clarifying wine and beer, and in medicine 2. a substance that has a tanning effect

Britannica Concise

Any of a group of pale yellow to light brown amorphous substances widely distributed in plants and used chiefly in tanning leather, dyeing fabric, and making ink. Their solutions are acid and have an astringent taste. They are isolated from oak bark, sumac, myrobalan (an Asian tree), and galls. Tannins give tea astringency, color, and some flavor. Tannins are used industrially to clarify wine and beer, reduce viscosity of oil-well drilling mud, and prevent scale in boiler water; they have also had medical uses.

Oxford Reference Dictionary

n. any of a group of complex organic compounds found in certain tree-barks and oak-galls, used in leather production and ink manufacture. Etymology: F tanin (as TAN(1), -IN)

Webster's 1913 Dictionary

Tannic Tan"nic, a. Of or pertaining to tan; derived from, or resembling, tan; as, tannic acid. Tannic acid. (Chem.) (a) An acid obtained from nutgalls as a yellow amorphous substance, C14H10O9, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin, and gallotannic acid. (b) 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.

Webster's 1913 Dictionary

Tannin Tan"nin, n. [Cf. F. tannin.] (Chem.) Same as Tannic acid, under Tannic.

Collin's Cobuild Dictionary

Tannin is a yellow or brown chemical that is found in plants such as tea. It is used in the process of making leather and in dyeing.



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