1. a gentle slope, especially one leading up to a fortification
Usage: military architecture

Examples

• The fortress was protected by a wide glacis that provided clear fields of fire.
• Enemy troops would be exposed while crossing the open glacis.
• The military engineer designed the glacis to deflect cannon fire.
• Attackers found no cover on the smooth glacis approaching the walls.
• The glacis sloped gently downward from the main fortification.
• Medieval castles often featured a glacis to enhance their defensive capabilities.