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batardeau (plural batardeaus)

  1. A cofferdam.
    (Can we find and add a quotation of Brande & C. to this entry?)
  2. (military) 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.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.