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Tannin

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tannin

(Science: chemistry plant biology) bitter-tasting, complex aromatic compounds found in the vacuoles of certain plant cells, for example in bark.

Some are glucosides, possibly giving protection to the plant or concerned with pigment formation.They are strongly astringent and are used in tanning and dyeing. Any of various complex phenolic substances of plant origin; used in tanning and in medicine.An organic compound that is found commonly in plants after pathogenic attack in the form of a gall. Tannins are an acidic chemical that is also found commonly is bark, leaves and unripe fruits.