verdigris

(vʉr′di grēs′, -gris)

noun

a green or greenish-blue poisonous compound, a basic acetate of copper, prepared by treating copper with acetic acid and used as a pigment, dye, etc.
a green or greenish-blue coating () that forms like rust on brass, bronze, or copper

Origin: ME vertegrez < MFr verdegris < OFr vert de Grece, lit., green of Greece < verd, green (see vert) + de, of + Grece, Greece

See verdigris in American Heritage Dictionary 4

noun

A blue or green powder consisting of basic cupric acetate used as a paint pigment and fungicide.
A green patina or crust of copper sulfate or copper chloride formed on copper, brass, and bronze exposed to air or seawater for long periods of time.

Origin:

Origin: Middle English vertegrez

Origin: , from Old French verte grez

Origin: , alteration of vert-de-Grice

Origin: : verd, green; see verdant

Origin: + de, of (from Latin dē; see de-)

Origin: + Grice, Greece

A river, about 451 km (280 mi) long, of southeast Kansas and northeast Oklahoma flowing generally southward to the Arkansas River.

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