definition of
Fossa

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

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

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