Lewis Short
(adjective) : Permessus, i, m., = Περμησσός
* A river in Boeotia sacred to Apollo and the Muses, which rises in Mount Helicon and flows into the Copaic lake, Verg. E. 6, 64.— Hence
* Permessis, ĭdis or ĭdos, adj. f., Permessian, Mart. 1, 77, 11; 8, 70, 3.
* Permessĭus, a, um, , Permessian: fons,Claud. Laud. Seren. 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary