#1 fossa n. [pit] a concavity in a surface (especially an anatomical depression). wn
#2 fossa n. [Fossa, genus Fossa] monotypic genus of Madagascar civets closely related to palm civets. wn
#3 fossa n. [fossa cat, Cryptoprocta ferox] largest carnivore of Madagascar; intermediate in some respects between cats and civets. wn
vizzz