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cuprous

[kyoo-pruh s, koo-] /ˈkyu prəs, ˈku-/
adjective
1.
containing copper in the univalent state, as cuprous oxide, Cu 2 O.
Origin
1660-1670
1660-70; cupr- + -ous
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for more cuprous

cuprous

/ˈkjuːprəs/
adjective
1.
of or containing copper in the monovalent state
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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more cuprous in Science
cuprous
  (k'prəs, ky'-)   
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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