Lewis Short
Rhĭon | Rhĭum (noun N) : or
* A strait between the Ionian Sea and the Corinthian Gulf, Liv. 27, 29; 28, 7; Mel. 2, 3.
* A promontory of Achaia near this strait, now Kastro Morea, Plin. 4, 2, 3, § 6.
* A town near the same strait, Liv. 27, 30 (al. Aegium).
Charlton T. Lewis, Charles Short, A Latin Dictionary