Foss

noun

1. A ditch; a canal; a stream or river artificially made or enlarged.
2. Specifically In fortification, a hollow place, ditch, or moat, commonly full of water, lying between the scarp and the counterscarp below the rampart, and turning round a fortified place or a post that is to be defended. See cut under castle.
3. In anatomy, same as fossa.
4. Same as force.
5. A simplified spelling of fosse.