an·​ti·​lepton | \ " +\

Definition of antilepton

: an antiparticle (such as a positron or an antineutrino) of a lepton

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 antilepton

1959, in the meaning defined above

History and Etymology for antilepton

anti- entry 1 + lepton entry 3

Keep scrolling for more

Learn More about antilepton

Statistics for antilepton

Look-up Popularity

Time Traveler for antilepton

The first known use of antilepton was in 1959

See more words from the same year

Comments on antilepton

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


to speak slightingly about or to degrade

Get Word of the Day daily email!

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
True or False

Test your knowledge - and maybe learn something along the way.

Dictionary Devil

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!