- A large building that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king.
- A chess piece shaped like a castle tower which is also called a rook.
- (obsolete) A close helmet.
verb (castl, ing)
- 1786, Francis Grose, A Treatise on Ancient Armour and Weapons, p. 12,
- : The was perhaps a figurative name for a close headpiece deduced from its enclosing and defending the head, as a castle did the whole body; or a corruption from the Old French word casquetel, a small or light helmet.
Etymology: From Latin castellum, literally little camp, from castrum, camp, from casa, hut or cottage
- (chess) To perform the move of castling.
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Full Definition of castle