To save this word, you'll need to log in.
Definition of meson
: any of a group of fundamental particles (such as the pion and kaon) made up of a quark and an antiquark that are subject to the strong force and have zero or an integer number of quantum units of spin
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Semantic Drift Quiz
- Which of the following was once a synonym for fun?

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
Share meson
Time Traveler for meson
The first known use of meson was in 1939
See more words from the same year