Let's Compare Castle and Citadel


A castle (from Latin castellum) is a type of fortified structure built in Europe and the Middle East during the Middle Ages by nobility.

castle n 1: a large and stately mansion [syn: {palace}] 2: a large building formerly occupied by a ruler and fortified against attack 3: (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard [syn: {rook}] 4: interchanging the positions of the king and a rook [syn: {castling}] v : move the king two squares toward a rook and in the same move the rook to the square next past the king

50 Moby Thesaurus words for "castle": acropolis, bastion, beachhead, bishop, blockhouse, bridgehead, bunker, chateau, chessman, citadel, court, donjon, fasthold, fastness, fort, fortress, garrison, garrison house, hall, hold, keep, king, knight, man, manor, mansion, martello, martello tower, mote, motte, palace, palais, palatial residence, palazzo, pawn, peel, peel tower, piece, pillbox, post, queen, rath, rook, safehold, strong point, stronghold, tower, tower of strength, villa, ward

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]

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. [1913 Webster]

Castle, OK (town, FIPS 12750) Location: 35.47510 N, 96.38379 W Population (1990): 94 (57 housing units) Area: 0.5 sq km (land), 0.0 sq km (water) Zip code(s): 74833

Castle 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.


A citadel is a fortress protecting a town, sometimes incorporating a castle. The term derives from the same Latin root as the word "city", civis, meaning citizen.

citadel n : a stronghold into which people could go for shelter during a battle [syn: {bastion}]

32 Moby Thesaurus words for "citadel": acropolis, bastion, beachhead, blockhouse, bridgehead, bunker, castle, donjon, fasthold, fastness, fort, fortress, garrison, garrison house, hold, keep, martello, martello tower, mote, motte, peel, peel tower, pillbox, post, rath, redoubt, safehold, strong point, stronghold, tower, tower of strength, ward

Citadel \Cit"a*del\, n. [F. citadelle, It. citadella, di?. of citt? city, fr. L. civitas. See {City}.] A fortress in or near a fortified city, commanding the city and fortifications, and intended as a final point of defense. [1913 Webster] {Syn}. -- Stronghold. See {Fortress}. [1913 Webster]

Data Sources:

  • castle: WordNet (r) 2.0
  • castle: Moby Thesaurus II by Grady Ward, 1.0
  • castle: The Collaborative International Dictionary of English v.0.44
  • castle: The Collaborative International Dictionary of English v.0.44
  • castle: U.S. Gazetteer (1990)
  • castle: Easton's 1897 Bible Dictionary
  • citadel: WordNet (r) 2.0
  • citadel: Moby Thesaurus II by Grady Ward, 1.0
  • citadel: The Collaborative International Dictionary of English v.0.44

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