Source : Webster's Revised Unabridged Dictionary (1913)

Fosse \Fosse\, n. [F., fr. L. fossa, fr. fodere, fossum, to
   dig.]
   1. (Fort.) A ditch or moat.

   2. (Anat.) See {Fossa}.

   {Fosse road}. See {Fosseway}.

Source : WordNet®

fosse
     n : ditch dug as a fortification and usually filled with water
         [syn: {moat}]