Definify.com
Webster 1913 Edition
Tannic
Tan′nic
,Adj.
Of or pertaining to tan; derived from, or resembling, tan;
as,
. tannic
acidTannic acid
. (Chem.)
(a)
An acid obtained from nutgalls as a yellow amorphous substance,
C14H10O9
, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin
, and gallotannic acid
. (b)
By extension, any one of a series of astringent substances resembling tannin proper, widely diffused through the vegetable kingdom, as in oak bark, willow, catechu, tea, coffee, etc.