bulwark (
http://definr.com/bulwark)
n 1: an embankment built around a space for defensive purposes;
"they stormed the ramparts of the city"; "they blew the
trumpet and the walls came tumbling down" [syn:
rampart,
wall]
2: a fence-like structure around a deck [syn:
bulwarks]
3: a protective structure of stone or concrete; extends from
shore into the water to prevent a beach from washing away
[syn:
breakwater,
groin,
groyne,
mole,
seawall,
jetty]
v : defend with a bulwark