Source : Webster's Revised Unabridged Dictionary (1913)

Mitrailleuse \Mi`tra`illeuse"\, n. [F., fr. mitrailler to fire
   grapeshot, fr. mitraille old iron, grapeshot, dim. of OF.
   mite a mite.] (Mil.)
   A breech-loading machine gun consisting of a number of
   barrels fitted together, so arranged that the barrels can be
   fired simultaneously, or successively, and rapidly.