redan

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redan

(rɪˈdæn)
n
(Fortifications) a fortification of two parapets at a salient angle
[C17: from French, from earlier redent notching of a saw edge, from re- + dent tooth, from Latin dēns]
References in classic literature ?
"You who have imagined, traced, and combined between these bastions, these redans, these curtains, these half-moons; and are preparing that covered way?"
The re-entrant angles are filled with redans, albeit larger than the similar palisade redans in PRO [NAL] MPH 1 fol.