batardeau

Etymology

From French batardeau.

batardeau means A cofferdam. Lexicurio rates it Sui generis — a strength score of 90 out of 100.

noun

A cofferdam.“An experiment was tried during the day upon the dykes of the citadel, which, as before stated, are fed by means of a sluice opposite the Scheldt, and separated from those of the city by a batardeau.”
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.