parapet

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From our dictionary:
par•a•pet

(par'u•pit, -pet"),—n.
1. Fort.
a. a defensive wall or elevation, as of earth or stone, in a fortification. See diag. under bastion.
b. an elevation raised above the main wall or rampart of a permanent fortification.
2. any low protective wall or barrier at the edge of a balcony, roof, bridge, or the like.

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