[ kas-uhl, kah-suhl ]
/ ˈkæs əl, ˈkɑ səl /


verb (used with object), cas·tled, cas·tling.

to place or enclose in or as in a castle.
Chess. to move (the king) in castling.

verb (used without object), cas·tled, cas·tling. Chess.

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.

Origin of castle

before 1000; Middle English, Old English castel < Latin castellum castellum


cas·tle·like, adjectiveun·cas·tled, adjective

Definition for castle (2 of 3)

[ kas-uh l, kah-suh l ]
/ ˈkæs əl, ˈkɑ səl /


Irene (Foote),1893–1969, born in the U.S., and her husband and partner Vernon (Vernon Castle Blythe), 1887–1918, born in England, U.S. ballroom dancers.

Definition for castle (3 of 3)

Castle, The


(German Das Schloss), a novel (1926) by Franz Kafka. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for castle

British Dictionary definitions for castle

/ (ˈkɑːsəl) /


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 rook 2


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)

Word Origin for castle

C11: from Latin castellum, diminutive of castrum fort
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012