Lewis & Short

Bolbitīnus, a, um, adj., of or belonging to the city of Bolbitine, now Rosetta, in Lower Egypt: ostium, the Rosetta mouth of the Nile, Plin. 5, 10, 11, § 64.
Later collat. form Bolbitĭcus, a, um: ostium, Mel. 1, 9, 9; Amm. 22, 15, 10.