par·a·pet 
(părə-pĭt, -pĕt′)
(părə-pĭt, -pĕt′)n.
1. A low protective wall or railing along the edge of a raised structure such as a roof or balcony.
2. An earthen or stone embankment protecting soldiers from enemy fire. See Synonyms at bulwark.
[French, from Italian parapetto : parare, to shield; see PARASOL + petto, chest (from Latin pectus).]