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Architecture the main tower within the walls of a medieval castle or fortress


Inner tower of a castle.

keep, donjon

The stronghold of a medieval castle, usually in the form of a massive tower, and a place of residence, esp. in times of siege.
References in periodicals archive ?
To keep from falling off the cycle, Holm has to pay close attention to his center of gravity--the spot where most of the mass of his body is concentrated.
Years of experience enable him to naturally shift his weight to steer or to keep from falling.