DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   atomic number 18
       n 1: a colorless and odorless inert gas; one of the six inert
            gases; comprises approximately 1% of the earth's atmosphere
            [syn: argon, Ar, atomic number 18]