"fossa" in the noun sense
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
Source: WordNet® (An amazing lexical database of English)
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