verdigris

Stedman's Medical Dictionary: A Practical Medical Dictionary · 1920 · p. 37

(ver'de-gres) [O.Fr. verd, green, de, of, Gris, Greeks.] i. Copper subacetate, aerugo. 2 Green rust, the stain on dirty copper ve els, ustially a carbonate of copper, crys'tallized or distilled v., cupri acetas neutral is.