Batardeau
Pronunciation : Ba`tar*deau"
Part of Speech : n.
Etymology : [F.]
Definition : 1. A cofferdam. Brande & C.
2. (Mil.)
Defn: A wall built across the ditch of a fortification, with a sluice gate to regulate the height of water in the ditch on both sides of the wall.
Source : Webster's Unabridged Dictionary, 1913