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Found one definition

1.                 From The Elements (07Nov00):
                   
   
   
                   
                     
   copper
   Symbol: Cu
   Atomic number: 29
   Atomic weight: 63.54
   Red-brown transition element. Known by the Romans as 'cuprum.' Extracted
   and used for thousands of years. Malleable, ductile and an excellent
   conductor of heat and electricity. When in moist conditions, a greenish
   layer forms on the outside.