Wordnet 3.0
NOUN (1)
1.
level space where heavy guns can be mounted behind the parapet at the top of a rampart;
The Collaborative International Dictionary of English v.0.48:
Terreplein \Terre"plein`\, n. [F., fr. L. terra earth + planus
even, level, plain.]
1. (Fort.) The top, platform, or horizontal surface, of a
rampart, on which the cannon are placed. See Illust. of
Casemate.
[1913 Webster]
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.
[Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
terreplein
n 1: level space where heavy guns can be mounted behind the
parapet at the top of a rampart