verdigris

[vur-di-grees, -gris] Origin

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. 2012.
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Verdigris is always a great word to know.
So is interrobang. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
verdigris (ˈvɜːdɪɡrɪs)
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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