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Comprehensive
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gallic acid a clear, crystalline acid derived from tannin, used in photography and in inks and dyes.
guarana a substance containing caffeine and tannin that is made from the seeds of a South American shrub of the soapberry family, used as a stimulant. [1/2 definitions]
tanbark the bark of various trees such as oak or hemlock, as a source of tannin.
tannic relating to or obtained from tannin or tanbark. [2 definitions]
tannic acid see "tannin."