adjective Ach·er·o·ni·an \¦a-kə-¦rō-nē-ən, -nyən\

Definition of Acheronian

  1. :  dark and gloomy :  dismal in the depths of an Acheronian forest

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Origin and Etymology of acheronian

acheron + -ian

First Known Use: 1855

Seen and Heard

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to cast off or become cast off

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