Hypertext Webster Gateway: "glacis"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Glacis \Gla"cis\, n. [F. glacis; -- so named from its
smoothness. See {Glacier}.]
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}).
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