Sentence:  "Half Moon." An Outwork conſiſting of two Faces, which makes an "Angle Salient", the <WSD>Gorge</WSD> whereof bends in like a Bow, or Creſcent, and were formerly us'd to cover the Point of a Baſtion, which diſtinguiſhes them from "Ravelins", always plac'd before the Curtin; ... 
Meaning of the word marked with <WSD> tags:  The entrance to an outwork, such as a bastion.