Source : Webster's Revised Unabridged Dictionary (1913)

Foussa \Fous"sa\, n. [Natibe name.] (Zo["o]l.)
   A viverrine animal of Madagascar ({Cryptoprocta ferox}). It
   resembles a cat in size and form, and has retractile claws.

Source : WordNet®

Cryptoprocta ferox
     n : largest carnivore of Madagascar; intermediate in some
         respects between cats and civets [syn: {fossa}, {fossa
         cat}]