Meaning of Acheronian in English:

Acheronian

Pronunciation /ˌakəˈrəʊnɪən/

adjective

literary
  • Of, relating to, or suggestive of the underworld of the ancient Greeks, or the mythical river Acheron; infernal, hellish; dark, gloomy.

Origin

Mid 19th century; earliest use found in Tait's Magazine. From Acheron + -ian.