castle

A castle is a huge, grand home where a king or queen might live. Almost all castles are also fortified against attacks by enemy armies.

Most castles were built in the Middle Ages by royalty or other nobility. You can still visit many historic castles in Europe, most of them built of stone and including details like towers and guardhouses. You can also call the chess piece known as a "rook" a castle, for its castle-like shape. The word has an Old English root, castel, or "village."

Primary Meanings of castle

1.
n
a large building formerly occupied by a ruler and fortified against attack
2.
nv
(chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
move the king two squares toward a rook and in the same move the rook to the square next past the king
Full Definitions of castle
1

n a large building formerly occupied by a ruler and fortified against attack

Examples:
Balmoral Castle
a castle in northeastern Scotland that is a private residence of the British sovereign
Type of:
fortification, munition
defensive structure consisting of walls or mounds built around a stronghold to strengthen it

n a large and stately mansion

Synonyms:
palace
Examples:
Buckingham Palace
the London residence of the British sovereign
Type of:
hall, manse, mansion, mansion house, residence
a large and imposing house
2

n (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard

Synonyms:
rook
Type of:
chess piece, chessman
any of 16 white and 16 black pieces used in playing the game of chess

n interchanging the positions of the king and a rook

Synonyms:
castling
Type of:
chess move
the act of moving a chess piece

v move the king two squares toward a rook and in the same move the rook to the square next past the king

Type of:
go, move
have a turn; make one's move in a game

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