DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   barn
       n 1: an outlying farm building for storing grain or animal feed
            and housing farm animals
       2: (physics) a unit of nuclear cross section; the effective
          circular area that one particle presents to another as a
          target for an encounter [syn: barn, b]