fos·sa n.; pl. fossæ Anat. A pit, groove, cavity, or depression, of greater or less depth; as, the temporal fossa on the side of the skull; the nasal fossæ containing the nostrils in most birds.
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fossa
n 1: a concavity in a surface (especially an anatomical
depression) [syn: pit]
2: monotypic genus of Madagascar civets closely related to palm
civets [syn: genus Fossa]
3: largest carnivore of Madagascar; intermediate in some
respects between cats and civets [syn: fossa cat, Cryptoprocta
ferox]
[also: fossae (pl)]