Meaning

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

noun monotypic genus of Madagascar civets closely related to palm civets

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

origin[Alt: Cryptoprocta ferox Borrowing from Malagasy fosa which likely once referred to the Malayan weasel (Mustela nudipes) prior to a semantic shift, thus cognate with Malay pusak and Tagalog pusa both meaning "cat".

Etymology from Wiktionary, CC BY-SA 3.0