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garvsyra form.
chem. tannin; gallotannin; tannic acid
environ. tannin One of a group of complex organic chemicals commonly found in leaves, unripe fruits, and the bark of trees. Their function is uncertain though the unpleasant taste may discourage grazing animals. Some tannins have commercial uses, notably in the production of leather and ink; used in tanning, as a mordant in dyeing, and in ink manufacture