batardeau
Ba`tar*deau", n. Etym: [F.] 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.
Ba`tar*deau", n. Etym: [F.] 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.