Also used as a term to identify geographic features of other planets to denote long and narrow depressions. A few examples from Mars:
Fos"sa (?), n.; pl. FossAe (#). [L., a ditch. See Fosse.] Anat.
A pit, groove, cavity, or depression, of greater or less depth; as, the temporal fossa on the side of the skull; the nasal fossae containing the nostrils in most birds.
© Webster 1913.
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