Merriam-Webster Collegiate Dictionary - copper

 I. noun  Usage: often attributive  Etymology: Middle English coper, from Old English, from Late Latin cuprum ~, from Latin (aes) Cyprium, literally, Cyprian metal  Date: before 12th century  1. a common reddish metallic element that is ductile and malleable and is one of the best conductors of heat and electricity — see element table  2. a coin or token made of ~ or bronze  3. chiefly British a large boiler (as for cooking)  4. any of a subfamily (Lycaeninae of the family Lycaenidae) of small butterflies with usually ~-colored wings  II. transitive verb  (~ed; ~ing)  Date: 1530 to coat or sheathe with or as if with ~  III. noun  Etymology: 2cop  Date: 1846 police officer