WordReference Random House Unabridged Dictionary of American English © 2019
aur•ous  (ôrəs),USA pronunciation adj. 
  1. Chemistryof or containing gold in the univalent state.
  2. of or containing gold.
  • aur-1 + -ous 1860–65

Collins Concise English Dictionary © HarperCollins Publishers::

aurous /ˈɔːrəs/ adj
  1. of or containing gold, esp in the monovalent state
Etymology: 19th Century: apparently from French aureux, from Late Latin aurōsus gold-coloured, from Latin aurum gold


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