ravelin

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ravelin

(ˈrævlɪn)
n
(Fortifications) fortifications an outwork having two embankments at a salient angle
[C16: from Italian ravellino a little bank, from riva bank, from Latin rīpa]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
For what dread of want or poverty that can reach or harass the student can compare with what the soldier feels, who finds himself beleaguered in some stronghold mounting guard in some ravelin or cavalier, knows that the enemy is pushing a mine towards the post where he is stationed, and cannot under any circumstances retire or fly from the imminent danger that threatens him?
On the approaches to St Petersburg, it straddles a cluster of islands with an intricately woven network of daunting rubble bastions, curtain walls and ravelins punctuated by austere ashlar NeoClassical openings.