cuprous

from WordNet (r) 3.0 (2006)

cuprous
    adj 1: of or containing divalent copper [syn: {cupric},
           {cuprous}]

from The Collaborative International Dictionary of English v.0.48

Cuprous \Cu"prous\ (k?"pr?s), a. [From {Cuprum}.] (Chem.)
   Of, pertaining to, or derived from, copper; containing
   copper; -- said of those compounds of copper in which this
   element is present in its highest proportion.
   [1913 Webster]