ver·di·gris

[vur-di-grees, -gris]
noun
a green or bluish patina formed on copper, brass, or bronze surfaces exposed to the atmosphere for long periods of time, consisting principally of basic copper sulfate.
Also called aerugo.


Origin:
1250–1300; < Middle French vert de gris; replacing Middle English vertegrez < Anglo-French vert de Grece, Old French vere grez green of Greece

ver·di·gris·y, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
verdigris (ˈvɜːdɪɡrɪs) [Click for IPA pronunciation guide]
 
n
1.  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
 
[C14: from Old French vert de Grice green of Greece]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Verdigris is always a great word to know.
So is quincunx. Does it mean:
the offspring of a zebra and a donkey.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

verdigris
1300, from O.Fr. verte grez (13c.), verte de Grece (c.1170), lit. "green of Greece," from obs. Fr. verd, from L. viridis (see verdure). The reason for it being called that is not known.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
On the inside, two veins the color of verdigris were visible.
The verdigris had partially darkened and discolored.
The green color of the monument is the result of verdigris or green rust of copper.
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