To save this word, you'll need to log in.
lep·ton | \ lep-ˈtän 
\
\ plural lepta\ lep-ˈtä \
\Definition of lepton
(Entry 1 of 2)
: a former monetary unit equal to ¹/₁₀₀ drachma
lepton
noun (2)lep·ton | \ ˈlep-ˌtän \
\Definition of lepton (Entry 2 of 2)
: any of a family of particles (such as electrons, muons, and neutrinos) that have spin quantum number ¹/₂ and that experience no strong forces
Other Words from lepton
Noun (2)
leptonic \ lep-ˈtä-nik \ adjective
\ adjectiveKeep scrolling for more
Comments on lepton
What made you want to look up lepton? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
The Eponym Quiz
- Which is the best synonym of bowdlerize?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- The Eponym Quiz
Do you know these words that come from names?
Take the quiz - Liar, Liar Quiz
Test your knowledge of words for lies, liars, and those being lied to. In other words, everyone.
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Citation
Do you know the person or title these quotes describe?
Play the game
Share lepton
Time Traveler for lepton
The first known use of lepton was circa 1741
See more words from the same year