The Collaborative International Dictionary of English v.0.48:

Aurous \Au"rous\, a.
   1. Containing gold.
      [1913 Webster]

   2. (Chem.) Pertaining to, or derived from, gold; -- said of
      those compounds of gold in which this element has its
      lower valence; as, aurous oxide.
      [1913 Webster]

WordNet (r) 3.0 (2006):

aurous
    adj 1: of or relating to or containing or derived from gold
           [syn: aurous, auric]