ver|di|gris

ver|di|gris «VUR duh grees, -grihs», noun.

1. a green or bluish coating, usually of a carbonate of copper, that forms on brass, copper, or bronze when exposed to the air for long periods of time.

2. a green or bluish-green poisonous compound obtained by the action of acetic acid on thin plates of copper, used as a pigment, in dyeing, and in insecticides; basic acetate of copper.

3. Chemistry. a bluish-green poisonous compound used especially in making synthetic rubber and textiles; normal acetate of copper. Formula: C₄H₆CuO₄•H₂O

╂[< Old French vert de Grece (literally) green of Greece; confused with Old French gris gray]