noun

1. a green or greenish-blue poisonous compound, a basic acetate of copper, prepared by treating copper with acetic acid and used as a pigment, dye, etc.
2. a green or greenish-blue coating (false verdigris) that forms like rust on brass, bronze, or copper

Etymology: ME vertegrez < MFr verdegris < OFr vert de Grece, lit., green of Greece < verd, green (see vert) + de, of + Grece, Greece