n. 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
n. a copper penny
n. a reddish-brown color resembling the color of polished copper
n. any of various small butterflies of the family Lycaenidae having coppery wings
n. 铜, 警察
[化] 铜Cu