Meaning

noun a blue or green powder used as a paint pigment

noun a green patina that forms on copper or brass or bronze that has been exposed to the air or water for long periods of time

verb color verdigris

originFrom Middle English vertegrece, verdegres, from Old French verte grez (literally “acidic green”), an alteration of older verte de Grece (literally “green of Greece”). The modern French writing of this word is vert-de-gris (literally “green of gray”).

Etymology from Wiktionary, CC BY-SA 3.0