Acheron noun. 
['akǝrɒn] E16.[Latin Acheron(t-) from Greek Akherōn.]In Greek mythology, one of the rivers of Hades; the infernal regions.
 ■   Ache'rontic adjective of or pertaining to Acheron, infernal; gloomy; on the brink of death: 
L16.  [TahlilGaran] English Dictionary ▲