Symbol Cu A ductile, malleable, reddish-brown metallic element that is an excellent conductor of heat and electricity and is widely used for electrical wiring, water piping, and corrosion-resistant parts, either pure or in alloys such as brass and bronze. Atomic number 29; atomic weight 63.54; melting point 1,083°C; boiling point 2,595°C; specific gravity 8.96; valence 1, 2. See Table at element.
A coin, usually of small denomination, made of copper or a copper alloy.
Chiefly British A large cooking pot made of copper or often of iron.
Any of various small butterflies of the subfamily Lycaeninae, having predominantly copper-colored wings.
A reddish brown.
tr.v.
cop·pered, cop·per·ing, cop·pers
To coat or finish with a layer of copper.
Slang To bet against, as in faro.
[Middle English coper, from Old English, from Late Latin cuprum, from Latin Cyprium (aes), Cyprian (metal), from Cyprius, of Cyprus, from Greek Kuprios, from Kupros, Cyprus.] cop'per·y adj.
[kop-uh-ree] 
ə