(computing, informal) A user or advocate of free open source software.

A little hollow; a dimple. / (medicine) A small, deep-centred ulcer of the transparent cornea. / (dentistry) A small depression in the crown of a tooth

plural of FOSSer

Obsolete form of faucet.

A Roman military road with a fosse or ditch on each side to keep it dry.

plural of fosseway

plural of fossette

plural of fosset

A surname.

plural of Fossett