/glay"sis, glas"is/ , n. , pl. glacis /glay"seez, -siz, glas"eez, -iz/ , glacises .
1. a gentle slope.
2. Fort. 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.
[ 1665-75; glacier to slide; cf. L glaciare to make into ice; see GLACÉ ]