gla·cis

[gley-sis, glas-is]
noun, plural gla·cis [gley-seez, -siz, glas-eez, -iz] , gla·cis·es.
1.
a gentle slope.
2.
Fortification. 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.

Origin:
1665–75; < Middle French; akin to Old French glacier to slide; compare Latin glaciāre to make into ice; see glacé

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
glacis (ˈɡlæsɪs, ˈɡlæsɪ, ˈɡleɪ-) [Click for IPA pronunciation guide]
 
n , pl -ises, -is
1.  a slight incline; slope
2.  an open slope in front of a fortified place
3.  short for glacis plate
 
[C17: from French, from Old French glacier to freeze, slip, from Latin glaciāre, from glaciēs ice]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Glacis is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
the offspring of a zebra and a donkey.
Etymonline
Word Origin & History

glacis
"sloping bank" (especially leading up to a fortification), 1672, from Fr. glacir "to freeze, make slippery," from O.Fr. glacier "to slip," from L. glaciare "to make or turn into ice," from glacies (see glacial).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The design is for the fixture for the turret, rear, upper side and upper glacis panels.
Water had been thrown upon the glacis, so that it was slippery with ice.
On the glacis, or north bank of the demilune moat, a small cemetery was established when the fort was under construction.
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