castle
1. cas.tle \'kas-*l\ n [ME castel, fr. OE, fr. ONF, fr. L castellum
fortress, castle, dim.] of castrum fortified place; akin to L castrare to
castrate 1a: a large fortified building 1b: a massive or imposing house
2: a retreat safe against intrusion or invasion 3: ROOK
2. castle \'kas-(*-)lin\ vb or cas.tled; or cas.tling 1: to establish in a
castle 2: to move (the king in chess) in castling 1: to move the king two
squares toward a rook and in the same move the roo k to the square next
past the king of the king 2: to move in castling