- (rare) A castle or other fortification.
- (chess) A piece shaped like a castle tower, that can be moved only up, down, left or right (but not diagonally) or in castling.
- A European bird, Corvus frugilegus, of the crow family.
- An Amish card game.
- A swindler; someone who betrays.
- (transitive) To cheat or swindle.
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Full Definition of rook