glacis
Speech parts
1. glacis - Noun
2. Glacis - Proper noun
Meaning
A gentle slope, or a smooth, gently sloping bank; especially (Fort.), that slope of earth which inclines from the covered way toward the exterior ground or country (see Illust. of Ravelin).
Source: Webster's dictionarySynonyms
Antonyms
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Ancient British hill forts started to incorporate glacis around 350 BC.
Each trench brings the infantry across the whole width of the leading edge; the first is out of range of the defenders and can withstand an assault from the rear; the third is at the foot of the glacis.
Anti-tank mines which employ a tilt-rod fuze are also designed to detonate directly underneath the glacis plate.
More generally, the term glacis can denote any slope, natural or artificial, which fulfils the above requirements.
In a head-on-head armored engagement, the glacis plate is the largest and most obvious target available to an enemy gunner.
The walls were seven feet (2.1 meters) high and fourteen feet (4.3 meters) thick, and the whole works was surrounded by a glacis and a dry moat five feet (1.5 meters) deep and convert wide.