Glacis

n.

1.

(Fort.) A gentle slope, or a smooth, gently sloping bank; especially (Fort.), that slope of earth which inclines from the covered way toward the exterior ground or country (see Illust. of Ravelin).

abatis, advanced work, balistraria, bank, banquette, barbed-wire entanglement, barbican, barricade, barrier, bartizan, bastion, battlement, bevel, bezel, breastwork, bulwark, casemate, cheval-de-frise, chute, circumvallation, contravallation, counterscarp, curtain, demibastion, dike, drawbridge, earthwork, easy slope, enclosure, entanglement, escarp, escarpment, fence, fieldwork, fleam, fortalice, fortification, gentle slope, grade, gradient, hanging gardens, helicline, hillside, inclination, incline, inclined plane, launching ramp, loophole, lunette, machicolation, mantelet, merlon, mound, outwork, palisade, parados, parapet, pitch, portcullis, postern gate, ramp, rampart, ravelin, redan, redoubt, sally port, scarp, sconce, shelving beach, side, slope, steep slope, stiff climb, stockade, talus, tenaille, vallation, vallum, work