\Ver"di*gris\, n. [F. vert-de-gris, apparently from
verd, vert, green + de of + gris gray, but really a
corruption of LL. viride aeris (equivalent to L. aerugo),
from L. viridis green + aes, aeris, brass. See {Verdant}, and
2d {Ore}.]
1. (Chem.) A green poisonous substance used as a pigment and
   drug, obtained by the action of acetic acid on copper, and
   consisting essentially of a complex mixture of several
   basic copper acetates.
2. The green rust formed on copper. [Colloq.]
Note: This rust is a carbonate of copper, and should not be
      confounded with true verdigris. --U. S. Disp.
{Blue verdigris} (Chem.), a verdigris having a blue color,
   used a pigment, etc.
{Distilled verdigris} (Old Chem.), an acid copper acetate; --
   so called because the acetic acid used in making it was
   obtained from distilled vinegar.
{Verdigris green}, clear bluish green, the color of
   verdigris.

\Ver"di*gris\, v. t.
To cover, or coat, with verdigris. [R.] ``An old verdigrised
brass bugle.'' --Hawthorne.