ter·re·plein /ˈtɛrəˌplen/
Terre·plein n.
1. Fort. The top, platform, or horizontal surface, of a rampart, on which the cannon are placed. See Illust. of Casemate.
2. Civ. Engin. An embankment of earth with a broad level top, which is sometimes excavated to form a continuation of an elevated canal across a valley.
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terreplein
n : level space where heavy guns can be mounted behind the
parapet at the top of a rampart