The Collaborative International Dictionary of English v.0.48:

Oroide \O"roide\, n. [F. or gold (L. aurum) + Gr. e'i^dos form.]
   An alloy, chiefly of copper and zinc or tin, resembling gold
   in color and brilliancy. [Written also oreide.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

oroide
    n 1: alloy of copper and tin and zinc; used in imitation gold
         jewelry [syn: oroide, oreide]