copper

(kŏpˈər)

1. 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.
2. A coin, usually of small denomination, made of copper or a copper alloy.
3. Chiefly British A large cooking pot made of copper or often of iron.
4. Any of various small butterflies of the subfamily Lycaeninae, having predominantly copper-colored wings.
5. A reddish brown.

1. To coat or finish with a layer of copper.
2. Slang To bet against, as in faro.

Related Forms:

• copˈper·y adjective

(kŏpˈər)