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.
- 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 photonproton
For editors and proofreaders
Definition of photon in:
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.