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    Cas·tle
    /ˈkas(ə)l/

    noun

    • 1. a large building, typically of the medieval period, fortified against attack with thick walls, battlements, towers, and in many cases a moat: "Edinburgh Castle"

    verb

    • 1. make a special move (no more than once in a game by each player) in which the king is transferred from its original square two squares along the back rank toward a rook on its corner square which is then transferred to the square passed over by the king: "both of the players castled on the queenside"