Source : Webster's Revised Unabridged Dictionary (1913)

Castle \Cas"tle\, v. i. [imp. & p. p. {Castled}; p. pr. & vb. n.
   {Castling}.] (Chess)
   To move the castle to the square next to king, and then the
   king around the castle to the square next beyond it, for the
   purpose of covering the king.

Castled \Cas"tled\, a.
   Having a castle or castles; supporting a castle; as, a
   castled height or crag.

   2. Fortified; turreted; as, castled walls.

Source : WordNet®

castled
     adj : (of a building) having turrets and battlements in the style
           of a castle [syn: {battlemented}, {castellated}, {crenelated},
            {crenellated}]