DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   At
       n 1: a highly unstable radioactive element (the heaviest of the
            halogen series); a decay product of uranium and thorium
            [syn: astatine, At, atomic number 85]
       2: 100 at equal 1 kip in Laos