Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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