'Glacis' definitions:

Definition of 'Glacis'

From: GCIDE
  • 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]