Control variable
cupreous
1. of, consisting of, containing, or resembling copper; coppery
2. of the reddish-brown colour of copper
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
cupreous
[′kyü·prē·əs](science and technology)
Containing or resembling copper.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.