1. Plural of glacis: a gently sloping surface, especially the slope of a fortification that descends toward the moat or outer defenses.
Usage: military/fortification term; also used in architecture and geology
2. A smooth, gentle slope of land or terrain.
Usage: general usage

Examples

• The fortress was protected by multiple glacises that made direct assault difficult.
• The glacises of the old fortification are still visible today.
• Engineers designed the glacises to provide clear sight lines for defenders.
• The landscape featured several gentle glacises leading down to the valley.
• Medieval fortifications often incorporated glacises as part of their defensive strategy.