Tartar ::
Tartar (n.) A
reddish crust or
sediment in wine
casks, consisting essentially of crude cream of
tartar, and used in
marking pure cream of
tartar, tartaric acid,
potassium carbonate, black flux, etc., and, in
dyeing, as a
mordant for
woolen goods; --
called also
argol, wine
stone, etc..