‖n.; pl. fossæ [ 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 fossæ containing the nostrils in most birds. [ 1913 Webster ]
n. [ Cf. F. fossane. ] (Zool.) A species of civet (Viverra fossa) resembling the genet. [ 1913 Webster ]