noun vac·u·ist \-yəwə̇st\

Definition of vacuist



  1. :  one who maintains that there are vacuums in nature by 1660 learned men were lining up on two opposing sides, the vacuists and the plenists — American Scientist — compare plenist

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 vacuist

New Latin vacuista, from Latin vacuum + -ista -ist

Seen and Heard

What made you want to look up vacuist? 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!