A reddish-brown metal, the chemical element of atomic number 29, used as a conductor of heat and electricity. The electrical wires in the house are made of copper.
A coin made of copper or bronze, especially a penny. He found a copper on the street and picked it up.
A small butterfly with bright reddish-orange wings. The garden was full of coppers fluttering among the flowers.
A police officer (British informal). The copper on the beat was well-known in the neighborhood.
A reddish-brown color resembling that of polished copper. The evening sky glowed a deep copper after the storm.
A large boiler or pot, traditionally made of copper, used for heating water or for laundry. On washday, the old copper in the scullery was filled and set to boil.