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glacis

From The Collaborative International Dictionary of English v.0.48:

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).
   [1913 Webster]

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