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[gley-sis, glas-is] /ˈgleɪ sɪs, ˈglæs ɪs/
noun, plural glacis
[gley-seez, -siz, glas-eez, -iz] /ˈgleɪ siz, -sɪz, ˈglæs iz, -ɪz/ (Show IPA),
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.
Origin of glacis
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. 2015.
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Examples from the web for glacis
  • 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.
British Dictionary definitions for glacis


/ˈɡlæsɪs; ˈɡlæsɪ; ˈɡleɪ-/
noun (pl) -ises, -is (-iːz; -ɪz)
a slight incline; slope
an open slope in front of a fortified place
short for glacis plate
Word Origin
C17: from French, from Old French glacier to freeze, slip, from Latin glaciāre, from glaciēs ice
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for glacis

"sloping bank" (especially leading up to a fortification), 1670s, from French glacir "to freeze, make slippery," from Old French glacier "to slip, glide," from Vulgar Latin *glaciare "to make or turn into ice," from glacies (see glacial).

Online Etymology Dictionary, © 2010 Douglas Harper
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