D defs.my
Entry 1 sense Webster, 1913

Cuprous

/(k?"pr?s)/ · Cu·prous · IPA /ˈkjuːpɹəs/
01 a. Of, pertaining to, or derived from, copper; containing copper; -- said of those compounds of copper in which this element is present in its…
  1. 1.
    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.(Chem.)