Têrre'-plein, n.

(têr'plān), n. [Fr. terreplein, or more correctly terreplein, from terre, Lat. terra, earth, and plain, Lat. planus, even, level, plain; but plein is equivalent to Lat. plenus, full.] (Fort.) The top, platform, or horizontal surface of a rampart, on which the cannon are placed. [See Illust. of Casemate.]