DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   castle
       n 1: a large and stately mansion [syn: palace, castle]
       2: a large building formerly occupied by a ruler and fortified
          against attack
       3: (chess) the piece that can move any number of unoccupied
          squares in a direction parallel to the sides of the
          chessboard [syn: castle, rook]
       4: interchanging the positions of the king and a rook [syn:
          castle, castling]
       v 1: move the king two squares toward a rook and in the same
            move the rook to the square next past the king