Share this entry
photon Syllabification: pho·ton
Pronunciation: /ˈfōtän/

Definition of photon in English:


A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Example sentences
  • The world of the realist is populated by electrons and photons, quarks and gluons.
  • Until now, physicists have only been able to entangle photons, electrons and atoms, using different methods in each case.
  • A photon has zero rest mass, but it carries energy and momentum.


Early 20th century: from Greek phōs, phōt- 'light', on the pattern of electron.

Words that rhyme with photon

Definition of photon in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources