gla·​cis | \ gla-ˈsē How to pronounce glacis (audio) , ˈgla-sē \
plural glacis\ gla-​ˈsēz How to pronounce glacis (audio) , ˈgla-​sēz \

Definition of glacis

1a : a gentle slope : incline
b : a slope that runs downward from a fortification

Examples of glacis in a Sentence

Recent Examples on the Web If a large laser takes five seconds to burn through a tank’s glacis plate, a modern chemical energy gun can engage two separate targets in the same amount of time. Kyle Mizokami, Popular Mechanics, "So...Should We Put Lasers on Tanks?," 19 Mar. 2020 Instead, the succeeding Jewish kingdom under Hasmonean rule cut into the glacis during construction in later years. National Geographic, "Jerusalem Dig Uncovers Ancient Greek Citadel," 22 Apr. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'glacis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of glacis

1672, in the meaning defined at sense 1a

History and Etymology for glacis

French, from glacer to freeze, slide

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Cite this Entry

“Glacis.” Dictionary, Merriam-Webster, Accessed 28 Feb. 2021.

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