noun be·ta·cism \ˈbā-tə-ˌsi-zəm also ˈbē-\

Definition of betacism



  1. :  loss of distinction between the sounds of b and v in a language or dialect

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 betacism

New Latin betacismus, from Latin beta (from Greek bēta) + Late Latin -cismus (as in iotacismus iotacism)

Seen and Heard

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


to cast off or become cast off

Get Word of the Day daily email!