
1) Fort embankment 2) French word used in English 3) Gentle slope 4) Vehicle armour
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https://www.crosswordclues.com/clue/glacis

More generally, the term glacis can denote any slope, natural or artificial, which fulfils the above requirements. The etymology of this French word suggests a slope made dangerous with ice, hence the relationship with glacier. ==Ancient fortifications== A glacis could also appear in ancient fortresses, such as the one built at Semna, by the ancie...
Found on
http://en.wikipedia.org/wiki/Glacis

a gentle slope in fortification
Found on
http://phrontistery.info/g.html

• (n.) A gentle slope, or a smooth, gently sloping bank; especially (Fort.), that slope of earth which inclines from the covered way toward the exterior ground or country (see Illust. of Ravelin).
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http://thinkexist.com/dictionary/meaning/glacis/

(from the article `military technology`) ...for protection against escalade, were dropped into the ground behind a ditch and protected from battery by gradually sloping earthen ramparts ...
Found on
http://www.britannica.com/eb/a-z/g/35

A bank sloping down from a castle which acts as a defence against invaders; broad, sloping naked rock or earth on which the attackers are completely exposed
Found on
http://www.castlesontheweb.com/glossary.html

A bank sloping down from a castle which acts as a defence against invaders; broad, sloping naked rock or earth on which the attackers are completely exposed
Found on
http://www.encyclo.co.uk/local/20018

An artificial slope of earth in the front of works, so constructed as to keep an assailant under the fire of the defenders to the last possible moment. On the natural groundlevel, troops attacking any high work would be sheltered from its fire when close up to it; the ground therefore is raised to form a glacis, which is swept by the fire of the pa...
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http://www.encyclo.co.uk/local/20766

Open space or slope surrounding a fort.
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http://www.encyclo.co.uk/local/20769

sloping ground on the attackers side of the covered way, cleared of all obstacles and therefore exposed to defensive fire. See fortification.
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http://www.encyclo.co.uk/local/20935

Rampart of the Covered Way, sloping away towards the enemy. Featured in the song 'The British Grenadiers'
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http://www.encyclo.co.uk/visitor-contributions.php
Gla'cis noun [ French
glacis ; -- so named from its smoothness. See
Glacier .] A gentle slope, or a smooth, gently sloping bank; especially
(Fort.) , that slope of earth which inclines from the covered way toward the exterior ground or country (see
Illust. of
Ravelin ...
Found on
http://www.encyclo.co.uk/webster/G/29

Slope up to a fortification.
Found on
http://www.napoleonguide.com/glossary.htm

In fortifications, a glacis is a smooth piece of ground, sloping upwards and clear of all obstacles, which must be crossed in order to enter a fort.
Found on
http://www.probertencyclopaedia.com/browse/FG.HTM

glacis 1. Through French: a gradual slope; an embankment sloping gradually up to a fortification, so as to expose attackers to defending gunfire. 2. Etymology: French, from Old French glacier, 'to slip'; from Latin glaciare, 'to make' or 'to turn into ice'.
Found on
http://www.wordinfo.info/words/index/info/view_unit/913/2

a gentle slope. · 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.
Found on
https://www.infoplease.com/dictionary/glacis
No exact match found.