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verdigris

[vur-di-grees, -gris] /ˈvɜr dɪˌgris, -grɪs/
noun
1.
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
1250-1300; < Middle French vert de gris; replacing Middle English vertegrez < Anglo-French vert de Grece, Old French vere grez green of Greece
Related forms
verdigrisy, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for verdigrisy

verdigris

/ˈvɜːdɪɡrɪs/
noun
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
Word Origin
C14: from Old French vert de Grice green of Greece
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for verdigrisy

verdigris

n.

c.1300, from Old French verte grez (13c.), verte de Grece (late 12c.), literally "green of Greece," from obsolete French verd, from Latin viridis (see verdure). The reason for it being called that is not known. In chemistry, confined to a basic copper acetate; popularly applied to the green encrustation on copper or brass exposed to the air.

Online Etymology Dictionary, © 2010 Douglas Harper
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