castle
//ˈkæsəl//
Noun
castleSingular
castlesPlural
1
A large fortified building or group of buildings with thick walls, towers, and often a moat, built in the past by rulers or nobles for defense and residence.
The old castle stands on top of the hill.
2
A large impressive house, especially one that resembles a fortified structure.
The wealthy businessman built a castle on the hill overlooking the valley.
3
In chess, a rook (the piece that moves horizontally or vertically).
Move your castle to protect the king.
Verb
1
In chess, to perform the move of castling, where the king and rook are moved simultaneously.
He castled on the kingside to protect his king.