DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   atomic number 93
       n 1: a radioactive transuranic metallic element; found in trace
            amounts in uranium ores; a by-product of the production of
            plutonium [syn: neptunium, Np, atomic number 93]