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1. (n.) tannin
any of a group of astringent vegetable principles or compounds, chiefly complex glucosides of catechol and pyrogallol, as the reddish compound that gives tanning properties to oak bark or the whitish compound that occurs in nutgalls.
Etymology: (earlier tanin < F (1798). See tan1, -in1)
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| Definition of 'tannin' |
Princeton's WordNet |
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1. (noun) tannin, tannic acid
any of various complex phenolic substances of plant origin; used in tanning and in medicine
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Webster Dictionary |
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1. (noun) tannin
same as Tannic acid, under Tannic
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| Definitions of 'tannin' |
The Nuttall Encyclopedia |
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1. tannin
an astringent principle found in gallnuts and the bark chiefly of the oak.
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Definitions of tannin 
