noun on·o·mas·ti·con \ˌänəˈmastə̇ˌkän, -kən\

Definition of onomasticon



  1. 1a :  a collection or listing of words especially in a specialized field (as science or commerce) b :  a work containing such a collection or listing :  wordbook, lexicon

  2. 2a :  a collection or listing of proper names of persons or places usually with etymologies b :  a work containing such a collection or listing

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of onomasticon

New Latin, from Greek onomastikon, from neuter of onomastikos onomastic

Seen and Heard

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


a rounded knoll or a ridge of ice

Get Word of the Day daily email!