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

Definition of Acheronian

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

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of Acheronian

1855, in the meaning defined above

History and Etymology for Acheronian

acheron + -ian

Keep scrolling for more

Learn More about Acheronian

Time Traveler for Acheronian

Time Traveler

The first known use of Acheronian was in 1855

See more words from the same year

Statistics for Acheronian

Cite this Entry

“Acheronian.” Dictionary, Merriam-Webster, Accessed 27 May. 2020.

Comments on Acheronian

What made you want to look up Acheronian? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

Obscure Shapes

  • a pile of three dimensional shapes in green
  • Something that is ooid is shaped like:
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!