DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   fen
       n 1: 100 fen equal 1 yuan in China
       2: low-lying wet land with grassy vegetation; usually is a
          transition zone between land and water; "thousands of acres
          of marshland"; "the fens of eastern England" [syn: marsh,
          marshland, fen, fenland]