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[kyoo-pruhs, koo-]
containing copper in the univalent state, as cuprous oxide, Cu 2 O.

1660–70; cupr- + -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cuprous (ˈkjuːprəs)
of or containing copper in the monovalent state

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
cuprous   (k'prəs, ky'-)  Pronunciation Key 
Containing copper, especially copper with a valence of 1. Compare cupric.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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