1. (

• pit ,
• fossa

) a concavity in a surface (especially an anatomical depression) ;

2. (

• Fossa ,
• genus_Fossa

) monotypic genus of Madagascar civets closely related to palm civets ;

3. (

• fossa ,
• fossa_cat ,
• Cryptoprocta_ferox

) largest carnivore of Madagascar; intermediate in some respects between cats and civets ;