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n.1.(Fort.) A semicircular projection made at the shoulder of a bastion for the purpose of covering the retired flank, - found in old fortresses.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The plain length of curtain wall running due south toward today's Bab Haha would necessarily have been partly buried (FILL) and partly razed (DEM) in 1564-6, for it intersected the new north-east demi-bastion, the retired flank behind the latter's orillon, and the flanker artillery emplacement and casemate.
Part of the old tower is likely to have been razed in 1564-6 (DEM), as it conflicted with the retired flank and flanker battery/casemate behind the orillon of the new south-east full angle bastion (Fig.