Glacis

Definition:

(n.) 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).

Compare glacis with other words:

coupure vs. glacis

glacis vs. tank

fortification vs. glacis

glacis vs. incline

esplanade vs. glacis

crotchet vs. glacis