- copper, Cu, atomic number 29 - a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
--1 is a kind of metallic element, metal; conductor
--1 is a substance of
--1 has particulars: blister copperbrass; bronze; bornite, peacock ore; chalcocite, copper glance; chalcopyrite, copper pyrites; cuprite; malachite