parapet

A low protective wall or railing along the edge of a raised structure such as a roof or balcony.

An earthen or stone embankment protecting soldiers from enemy fire. synonym: bulwark.

A wall or rampart rising breast-high.

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.

In anatomy, the alveolus, or alveolar border of the jawbone, in which the teeth are inserted.