definition of
fossa

[1] #1 fossa n. [pit] a concavity in a surface (especially an anatomical depression). wn

[2] #2 fossa n. [Fossa, genus Fossa] monotypic genus of Madagascar civets closely related to palm civets. wn

[3] #3 fossa n. [fossa cat, Cryptoprocta ferox] largest carnivore of Madagascar; intermediate in some respects between cats and civets. wn