The Collaborative International Dictionary of English v.0.48:Fosse \Fosse\, n. [F., fr. L. fossa, fr. fodere, fossum, to dig.] 1. (Fort.) A ditch or moat. [1913 Webster] 2. (Anat.) See Fossa. [1913 Webster] Fosse road. See Fosseway. [1913 Webster]