[ver.di.gris] n [ME vertegrez, fr. OF vert de Grice, lit., green of Greece] (14c) 1 a: a green or greenish blue poisonous pigment resulting from the action of acetic acid on copper and consisting of one or more basic copper acetates b: singly hydrated normal copper acetate
2: a green or bluish deposit esp. of copper carbonates formed on copper, brass, or bronze surfaces