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An outwork of fortifications, with two faces forming a salient angle, constructed beyond the main ditch and in front of the curtain.
‘A ravelin is a V shaped fortification used to protect the entrance of a fort.’
‘Madam, we require your presence on the north-western ravelin immediately.’
‘Detached works called ravelins or (from their appearance) demi-lunes (half-moons) often stood out in front of the curtain between the bastions, and sometimes extra works formed an extra outer skin of fortifications.’