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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Ni
       n 1: a hard malleable ductile silvery metallic element that is
            resistant to corrosion; used in alloys; occurs in
            pentlandite and smaltite and garnierite and millerite [syn:
            nickel, Ni, atomic number 28]