Definitions for tanninˈtæn ɪn
Random House Webster's College Dictionary
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.
Origin of tannin:
earlier tanin < F (1798). See tan1, -in1
tannin, tannic acid(noun)
any of various complex phenolic substances of plant origin; used in tanning and in medicine
Tannic acid or any of its derivatives.
same as Tannic acid, under Tannic
The Nuttall Encyclopedia
an astringent principle found in gallnuts and the bark chiefly of the oak.