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Webster's Dictionary (1865)

Băt-ăr-deau’, n.

noun

(băt-ăr-dō’), n. [Fr. batardeau, perh. contr. from bastarde d’eau, water-car. Cf. Eng. coffer-dam and Ger. krippe, crib.]

  1. A coffer-dam. Brande.
  2. (Mil.) A wall built across a ditch or fortification, with a sluice-gate by which the height of water in the ditch on both sides of the wall may be regulated.