a green or bluish patina formed on copper, brass, or bronze and consisting of a basic salt of copper containing both copper oxide and a copper salt
2.
a green or blue crystalline substance obtained by the action of acetic acid on copper and used as a fungicide and pigment; basic copper acetate
Word origin
C14: from Old French vert de Grice green of Greece
aerugo in American English
(iˈruːɡou, aiˈruː-)
noun
verdigris
Word origin
[1745–55; ‹ L, equiv. to aer- (s. of aesaes) + -ūgō suffix used in forming names of rusts and surface growths; cf. ferruginous, lanugo]This word is first recorded in the period 1745–55. Other words that entered Englishat around the same time include: debut, generalize, nickel, personification, symmetrical