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1. 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
   - Cu, atomic number 29
    
2. A copper penny
    
3. [Brit, informal] Uncomplimentary term for a policeman
   - bull [US, informal], cop [informal], pig [informal], rozzer [Brit, informal], bizzy [UK, dialect, informal], fed [Brit, informal], peeler [Brit, archaic]
    
4. A reddish-brown colour resembling the colour of polished copper
   - copper color [US], copper colour [Brit, Cdn]
    
5. Any of various small butterflies of the family Lycaenidae having coppery wings

1. Coat with a layer of copper

Derived forms: coppered, coppers, coppering

Type of: bobby [Brit, informal], burnt sienna, cent, centime, coat, conductor, lycaenid, lycaenid butterfly, mahogany, metal, metallic element, officer, penny, plod [Brit, informal], police officer, policeman, reddish brown, sepia, surface, Venetian red

Part of: bornite, brass, bronze, chalcocite, chalcopyrite, copper glance, copper pyrites, cuprite, genus Lycaena, Lycaena, malachite, peacock ore

Encyclopedia: Copper, Bronze and Iron Age sites in Kosovo