(n.) A steep descent or declivity; steep face or edge of a ridge; ground about a fortified place, cut away nearly vertically to prevent hostile approach. See Scarp.

abatis advanced work balistraria bank banquette barbed-wire entanglement barbican barricade barrier bartizan bastion battlement bluff breastwork bulwark casemate cheval-de-frise circumvallation cliff contravallation counterscarp crag curtain demibastion dike drawbridge earthwork enclosure entanglement escarp face fence fieldwork fortalice fortification glacis loophole lunette machicolation mantelet merlon mound outwork palisade palisades parados parapet portcullis postern gate precipice rampart ravelin redan redoubt sally port scar scarp sconce steep stockade tenaille vallation vallum wall work