Definition of copper
1
:a common reddish metallic element that is ductile and malleable and is one of the best conductors of heat and electricity — see Chemical Elements Table
2
:a coin or token made of copper or bronze
3
chiefly British
:a large boiler (as for cooking)
4
:any of a subfamily (Lycaeninae of the family Lycaenidae) of small butterflies with usually copper-colored wings
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