ravelin
Noun
Meaning
A detached work with two embankments which make a salient angle. It is raised before the curtain on the counterscarp of the place. Formerly called demilune, and half-moon.
Source: Webster's dictionarySynonyms
half-moon
bank
barbican
half
dike
barrier
enclosure
curtain
fortification
bastion
barricade
bulwark
battlement
banquette
mantlet
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