#1 copper n. [Cu, atomic number 29] a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor. wn
#2 copper v. coat with a layer of copper. wn
#3 copper n. a copper penny. wn
#4 copper n. [bull, cop, fuzz, pig] uncomplimentary terms for a policeman. wn
#5 copper n. [copper color] a reddish-brown color resembling the color of polished copper. wn
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