FOSS, or FOSSE, in fortification, &c. a ditch or
moat. The word is French, formed of the Latin par-
ticle fossum, of the verb fodio "I dig."
Fossa, Fossa, in anatomy, a kind of cavity in a bone,
with a large aperture, but no exit or perforation.
When the aperture is very narrow, it is called a sinus.
Foss is particularly used for the cavity or denture in
the back part of the neck.