copper

(noun) 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. Synonyms: Cu, atomic number 29.

(noun) a copper penny.

(noun) uncomplimentary terms for a policeman. Synonyms: bull, cop, fuzz, pig.

(noun) a reddish-brown color resembling the color of polished copper. Synonyms: copper color.

(noun) any of various small butterflies of the family Lycaenidae having coppery wings.

(verb) coat with a layer of copper.