01 n. A fortified residence, especially that of a prince or nobleman; a fortress.
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1.
A fortified residence, especially that of a prince or nobleman; a fortress.“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.“Our castle's strength Will laugh a siege to scorn.” — Shak.
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2.
Any strong, imposing, and stately mansion.
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3.
A small tower, as on a ship, or an elephant's back.
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4.
A piece, made to represent a castle, used in the game of chess; a rook.
Phrases & compounds
Castle in the air —
a visionary project; a baseless scheme; an air castle; -- sometimes called a castle in Spain (F. Château en Espagne).
Syn.
Fortress; fortification; citadel; stronghold. See Fortress.