Definition of: verdigris

(vûr′də·grēs, -gris) noun
1. Chem. A green basic acetate of copper obtained by treating copper with acetic acid: used as a pigment, for dyeing and calico printing, in medicine, and in the preparation of other copper pigments.
2. The green or bluish patina formed on copper, bronze, or brass surfaces after long exposure to the air. [<OF verd de Grice, vert de Grece, lit., green of Greece]