Verdigris word meaning and definition

[noun] a green patina that forms on copper or brass or bronze that has been exposed to the air or water for long periods of time
[noun] a blue or green powder used as a paint pigment
[verb] color verdigris

\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.

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