a fortified, usually walled residence, as of a prince or noble in feudal times.
the chief and strongest part of the fortifications of a medieval city.
a strongly fortified, permanently garrisoned stronghold.
a large and stately residence, especially one, with high walls and towers, that imitates the form of a medieval castle.
any place providing security and privacy:
It may be small, but my home is my castle.
Chess. the rook.
to place or enclose in or as in a castle.
Chess. to move (the king) in castling.
to move the king two squares horizontally and bring the appropriate rook to the square the king has passed over.
(of the king) to be moved in this manner.
a fortified building or set of buildings, usually permanently garrisoned, as in medieval Europe
any fortified place or structure
a large magnificent house, esp when the present or former home of a nobleman or prince
the citadel and strongest part of the fortifications of a medieval town
(chess) another name for rook2
(chess) to move (the king) two squares laterally on the first rank and place the nearest rook on the square passed over by the king, either towards the king’s side (castling short) or the queen’s side (castling long)
late Old English castel “village” (this sense from a biblical usage in Vulgar Latin); later “large fortified building, stronghold,” in this sense from Old North French castel (Old French chastel, 12c.; Modern French château), from Latin castellum “a castle, fort, citadel, stronghold; fortified village,” diminutive of castrum “fort,” from Proto-Italic *kastro- “part, share;” cognate with Old Irish cather, Welsh caer “town” (and perhaps related to castrare via notion of “cut off;” see caste). In early bibles, castle was used to translate Greek kome “village.”
This word also had come to Old English as ceaster and formed the -caster and -chester in place names. Spanish alcazar “castle” is from Arabic al-qasr, from Latin castrum. Castles in Spain translates 14c. French chastel en Espaigne (the imaginary castles sometimes stood in Brie, Asia, or Albania) and probably reflects the hopes of landless knights to establish themselves abroad. The statement that an (English) man’s home is his castle is from 16c.
move in chess, recorded under this name from 1650s, from castle (n.), as an old alternative name for the rook, one of the pieces moved. Related: Castled; castling.
a military fortress (1 Chr. 11:7), also probably a kind of tower used by the priests for making known anything discovered at a distance (1 Chr. 6:54). Castles are also mentioned (Gen. 25:16) as a kind of watch-tower, from which shepherds kept watch over their flocks by night. The “castle” into which the chief captain commanded Paul to be brought was the quarters of the Roman soldiers in the fortress of Antonia (so called by Herod after his patron Mark Antony), which was close to the north-west corner of the temple (Acts 21:34), which it commanded.
- Castles in the air
castles in the air Extravagant hopes and plans that will never be carried out: “I told him he should stop building castles in the air and train for a sensible profession.” Also, castles in Spain. Dreams about future success, as in Musing about the bestseller list, she was apt to build castles in the air. […]
noun Hamilton Young. 1858–98, US chemist, who devised the Castner process for extracting sodium from sodium hydroxide Contemporary Examples castner acknowledges that, in the end, he reasoned his way to the right answer: no gun in the minivan. Guns are Dangerous, Even When Used by Good Men David Frum April 28, 2013 castner told Donvan […]
thrown away; rejected; discarded: castoff clothing. a person or thing that has been cast off. Printing. the estimate by a compositor of how many pages copy will occupy when set in type. Historical Examples Doubtless she would hail his wish—half a reform in itself—to castoff the outward signs of an accepted degradation. What Will He […]
- Castner process
noun a process for extracting sodium from sodium hydroxide, devised by Hamilton Young Castner (1858–98)