Definition of barbacan

• n. - See Barbican.
• 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 and drawbridge of its own.
• n. - An opening in the wall of a fortress, through which missiles were discharged upon an enemy.
• n. - See Barbican.
• 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 and drawbridge of its own.
• n. - An opening in the wall of a fortress, through which missiles were discharged upon an enemy.