Lewis Short
Achĕrūsĭa | Achĕrūsĭs, ĭdis (noun F.f) : Acheruns.
* Acherusia Palus
* A lake in Epirus, through which the Acheron flows, Plin. 4, 1, 1.
* A cave in Bithynia, from which Cerberus is said to have been dragged, Mel. 1, 19, 7; Plin. 6, 1, 1; the same called , , , Val. Fl. 5, 73.
Charlton T. Lewis, Charles Short, A Latin Dictionary