DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Cu
       n 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 [syn:
            copper, Cu, atomic number 29]