[gley-sis, glas-is]
noun, plural glacis [gley-seez, -siz, glas-eez, -iz] , glacises.
a gentle slope.
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.

1665–75; < Middle French; akin to Old French glacier to slide; compare Latin glaciāre to make into ice; see glacé Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glacis (ˈɡlæsɪs, ˈɡlæsɪ, ˈɡleɪ-)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"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.
On the glacis, or north bank of the demilune moat, a small cemetery was established when the fort was under construction.
Water had been thrown upon the glacis, so that it was slippery with ice.
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