General

A defense work, round, rectangular, or polygonal in plan, projecting from the outer wall of a fortification, principally to defend

1. A fortification or castle, frequently used as a prison. 2. A tower or bulwark in the fortifications of a

1. A medieval settlement built for defense purposes and generally laid out with a geometric plan, esp. in France. 2.

A partly fortified house whose lowest story usually is vaulted.