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copper a reddish brown metal that is one of the chemical elements. Copper is used to make pipes, because it does not easily rust. It is also used to make wires, because it is an excellent conductor of electricity. It can be combined with other metals to make alloys such as brass and bronze. (symbol: Cu) [1/4 definitions]
tin a soft, light gray metal that is one of the chemical elements. Tin does not rust easily. It can be combined with other metals to form alloys such as bronze or pewter. (symbol: Sn) [1/2 definitions]