n. A wall or rampart rising breast-high.n. In architecture, a wall or barrier, either plain or ornamented, placed at the edges of platforms or balconies, roofs of houses, sides of bridges, etc., to prevent people from falling over; also, something resembling such a parapet in appearance or use. See cut under moucharaby.n. In anatomy, the alveolus, or alveolar border of the jawbone, in which the teeth are inserted.