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Relating to or containing gold, especially with valence 1.
[Latin aurum, gold + -ous.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) of or containing gold, esp in the monovalent state
[C19: apparently from French aureux, from Late Latin aurōsus gold-coloured, from Latin aurum gold]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014