Main Entry: ver·di·gris

Pronunciation: \ˈvər-də-ˌgrēs, -ˌgris, -grəs also -ˌgrē\

Function: noun

Etymology: Middle English vertegrese, from Anglo-French verdegrece, vert de Grece, literally, green of Greece

Date: 14th century

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 : normal copper acetate Cu(C₂H₃O₂)₂·H₂O
2 : a green or bluish deposit especially of copper carbonates formed on copper, brass, or bronze surfaces