01 n. A tower or advanced work defending the entrance to a castle or city, as at a gate or bridge. It was often large and strong, having a ditch …
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1.
A tower or advanced work defending the entrance to a castle or city, as at a gate or bridge. It was often large and strong, having a ditch and drawbridge of its own.(Fort.)
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2.
An opening in the wall of a fortress, through which missiles were discharged upon an enemy.