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Meaning of glacis

gla•cis

Pronunciation: (glā'sis, glas'is), [key]
— pl. gla•cis gla•cis•es.
  1. a gentle slope.
  2. a bank of earth in front of the counterscarp or covered way of a fort, having an easy slope toward the field or open country.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.