Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

fermion

play
noun fer·mi·on \ˈfer-mē-ˌän, ˈfər-\

Definition of fermion

  1. :  a particle (as an electron, proton, or neutron) whose spin quantum number is an odd multiple of 12 — compare boson

fermionic

play \ˌfer-mē-ˈä-nik, ˌfər-\ adjective


Origin and Etymology of fermion

Enrico Fermi + English 2-on


First Known Use: 1947


Learn More about fermion


Seen and Heard

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

WORD OF THE DAY

at a gallop

Get Word of the Day daily email!