castle
Pluralcastles
Verbcastles, castling, castled
Pluralcastles
Formscastles, castling, castled
- 1A large fortified building or group of buildings with strong walls and towers, built in earlier times as the home of a ruler or noble; also a grand, imposing mansion built in this style.
The medieval castle dominated the valley with its high walls and guarded gate.
They restored the crumbling castle and opened it to visitors.
Similarfortress, stronghold
- 2In informal usage, the rook in chess: the corner piece shaped like a small fortified tower.
She slid her castle along the open file to attack the queen.
He lost his last castle in a careless trade.
UsageCasual players say castle; careful or formal chess writing uses rook.
Similarrook
Note
A name taken from the piece's shape: the rook is made to look like a castle tower, and casual players call it after what it looks like.
Checked 2 Nov 2026 · 1 fact
- The chess name castle comes from the rook's resemblance to a castle tower. en.wikipedia.org
- 3In chess, to move the king two squares toward a rook and swing that rook past it in one turn, allowed only if neither piece has moved.
White chose to castle on the queenside, tucking the king behind a wall of pawns.
You cannot castle while your king is in check.
UsageOften names a side: castle on the kingside, castle queenside.
Note
Already in 1656, Francis Beale's translation of Gioachino Greco's The Royall Game of Chesse-Play says the king "may change (or Castle) with this Rooke," going "two draughts at once." The FIDE "2023 Laws of Chess" say that a player who touches king and rook "must castle on that side" if it is legal.
Checked 2 Nov 2026 · 5 facts
- The Royall Game of Chesse-Play was published in 1656, as confirmed by its first-edition title page. upload.wikimedia.org
- Francis Beale translated the work of Gioachino Greco. en.wikisource.org
- The book describes the king castling with a rook using both quoted phrases. en.wiktionary.org
- FIDE issued Laws of Chess applicable from 2023. handbook.fide.com
- Article 4.4.1 contains the quoted requirement to castle on the side of the touched rook when legal. handbook.fide.com
Less common meanings
- 4In chess, a single occurrence of castling; a defensive move that repositions the king and a rook simultaneously.
A well-timed castle can decide the safety of the king for the rest of the game.
Black delayed the castle too long and paid for it.
UsageCastling is the more common name for the move; a castle also appears.
Note
Chess uses the word for two different things, and context decides which is meant. Here it names a move, the king and rook shifting together in one turn. The informal name for the rook names a piece.
Checked 2 Nov 2026 · 1 fact
- Castling repositions the king and a rook within a single move. handbook.fide.com
- 5A small tower, such as one raised on a ship's deck or mounted on an elephant's back.
Sailors fired down on the enemy from the castle at the stern.
Each elephant bore a small castle strapped to its back, crowded with archers.
Note
A dated use that stays close to the word's Latin root, castellum, "small fort": here the castle shrinks to a single tower, raised on a ship or carried on an elephant's back.
Checked 2 Nov 2026 · 2 facts
- Castle derives from Latin castellum, a diminutive meaning “small fort”. en.wiktionary.org
- Castle has a dated sense meaning a small tower on a ship or an elephant’s back. en.wiktionary.org
- 6In cricket, to dismiss a batter by bowling the ball into the stumps, usually with a yorker or full-length delivery.
He castled the tail-ender first ball with a swinging yorker.
One unplayable delivery can castle a settled batter and turn the match.
Note
Usually the object is the batter, but the verb can also take the stumps themselves. BBC Sport in 2009 has a bowler who "castled Gayle's stumps," and Firdose Moonda in ESPNcricinfo (2011) describes a ball that "castled off stump." The image is the one behind the colloquial name for the wicket: the fortress is breached, and the wicket is broken.
- 7In cricket, an informal name for the wicket: the three stumps and two bails defended by the batter.
The yorker rattled his castle, and the umpire raised his finger.
He played across the line and lost his castle to a straight ball.
Note
Cricket talk turns the batter's stumps into a fortress to be defended and stormed. Gurdeep Singh's Cricket in Northern India (1966) praises a change bowler who "demolished the castle of any batsman." That is the typical pattern: the castle belongs to the batter, and the bowler knocks it down. The word is colloquial and suits commentary and match reports. The verb for bowling someone out grows from the same image.
Checked 31 Oct 2026 · 1 fact
- The book praises a change bowler using the exact words quoted. en.wiktionary.org
- 8To build in the form of a castle, or add real or imitation battlements to an existing building.
Note
A builder's verb that has fallen out of use, once covering both new castle-shaped construction and battlements added to an old building. The forms castles and castled are still current in the chess move and in cricket.
Checked 2 Nov 2026 · 1 fact
- The architectural verb covered both building in castle form and adding battlements to an existing building. en.wiktionary.org
- 9A fully enclosing helmet that covered the entire head and face, worn with plate armor.
Note
By 1786 the word was already a puzzle, and Francis Grose could only guess where it came from. Perhaps it was a figure for how the helmet enclosed and defended the head, as a castle did the whole body. Or perhaps it was a corruption of Old French casquetel, a small or light helmet. In modern writing on arms, the same piece is simply called a close helmet.
Checked 2 Nov 2026 · 3 facts
- By 1786 Francis Grose was offering tentative explanations of the helmet name's origin. archive.org
- Grose proposed that the name compared the helmet's protection of the head with a castle's protection of the whole body. archive.org
- Grose alternatively proposed corruption of what he called the old French word casquetel, meaning a small or light helmet. archive.org
- 10To shield or wall off someone or something, keeping it protected or set apart as if behind castle walls.
Castle me in the armes of thy everlasting strength.
1655, William Gurnall, The Christian in Compleat Armour - 11To house or keep someone or something within a castle.
- 12In shogi, a defensive formation in which several pieces are arranged around the king to shield it.
- 13In shogi, to form a defensive position by moving several pieces into a protective formation around the king.
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Origin
The word comes from Late Latin "castellum" ("small camp, fort"), a diminutive of Latin "castrum" ("camp, fort, citadel, stronghold"). It entered English via late Old English (where it first meant a town or village) and, in the sense of "castle," through Anglo-Norman/Old Northern French "castel"; it is a doublet of "château." The Latin "castrum" may go back to Proto-Indo-European *kat- ("hut, shed").
Checked 31 Oct 2026 · 5 facts
- Castle derives from Late Latin castellum, meaning a small camp or fort, a diminutive of Latin castrum, meaning camp, fort, citadel or stronghold. en.wiktionary.org
- The word occurs in late Old English with the earlier meaning town or village. en.wiktionary.org
- Anglo-Norman or Old Northern French castel supplied the castle sense. en.wiktionary.org
- Castle and château are doublets. en.wiktionary.org
- A proposed ultimate source of Latin castrum is Proto-Indo-European *kat-, meaning hut or shed. academiaprisca.org