glacis

[ gley-sis, glas-is ]
/ ˈgleɪ sɪs, ˈglæs ɪs /

noun, plural gla·cis [gley-seez, -siz, glas-eez, -iz] /ˈgleɪ siz, -sɪz, ˈglæs iz, -ɪz/, gla·cis·es.

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for glacis

glacis

/ (ˈɡlæsɪs, ˈɡlæsɪ, ˈɡleɪ-) /

noun plural -ises or -is (-iːz, -ɪz)

a slight incline; slope
an open slope in front of a fortified place
short for glacis plate

Word Origin for glacis

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