a reddish-brown, malleable, ductile, metallic element that is corrosion-resistant and an excellent conductor of electricity and heat: symbol, Cu; at. no., 29
Now Chiefly Brit.
a coin of copper or bronze, as a penny
a large metal container or boiler, orig. of copper
the color of copper; reddish brown
any of various small, copper-colored butterflies (family Lycaenidae) found in temperate regions