Acheronian

adjective

Ach·​er·​o·​ni·​an

¦a-kə-¦rō-nē-ən,

-nyən

: dark and gloomy : dismal

in the depths of an Acheronian forest

Word History

Etymology

acheron + -ian

First Known Use

1855, in the meaning defined above

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now