Castle in the air

Castle Cas"tle, n. [AS. castel, fr. L. castellum, dim. of castrum a fortified place, castle.] 1. A fortified residence, especially that of a prince or nobleman; a fortress. [1913 Webster]

The house of every one is to him castle and fortress, as well for his defense againts injury and violence, as for his repose. --Coke. [1913 Webster]

Our castle's strength Will laugh a siege to scorn. --Shak. [1913 Webster]

Note: Originally the medi[ae]val castle was a single strong tower or keep, with a palisaded inclosure around it and inferior buidings, such as stables and the like, and surrounded by a moat; then such a keep or donjon, with courtyards or baileys and accessory buildings of greater elaboration a great hall and a chapel, all surrounded by defensive walls and a moat, with a drawbridge, etc. Afterwards the name was retained by large dwellings that had formerly been fortresses, or by those which replaced ancient fortresses. A Donjon or Keep, an irregular building containing the dwelling of the lord and his family; B C Large round towers ferming part of the donjon and of the exterior; D Square tower, separating the two inner courts and forming part of the donjon; E Chapel, whose apse forms a half-round tower, F, on the exterior walls; G H Round towers on the exterior walls; K Postern gate, reached from outside by a removable fight of steps or inclined plane for hoisting in stores, and leading to a court, L (see small digagram) whose pavement is on a level with the sill of the postern, but below the level of the larger court, with which it communicates by a separately fortified gateway; M Turret, containing spiral stairway to all the stories of the great tower, B, and serving also as a station for signal fire, banner, etc.; N Turret with stairway for tower, C; O Echauguettes; P P P Battlemants consisting of merlons and crenels alternately, the merlons being pierced by loopholes; Q Q Machicolations (those at Q defend the postern K); R Outwork defending the approach, which is a road ascending the hill and passing under all four faces of the castle; S S Wall of the outer bailey. The road of approach enters the bailey at T and passes thence into the castle by the main entrance gateway (which is in the wall between, and defended by the towers, C H) and over two drawbridges and through fortified passages to the inner court. [1913 Webster]

2. Any strong, imposing, and stately mansion. [1913 Webster]

3. A small tower, as on a ship, or an elephant's back. [1913 Webster]

4. A piece, made to represent a castle, used in the game of chess; a rook. [1913 Webster]

{Castle in the air}, a visionary project; a baseless scheme; an air castle; -- sometimes called a {castle in Spain} (F. Ch[^a]teau en Espagne).

Syn: Fortress; fortification; citadel; stronghold. See {Fortress}. [1913 Webster]