Definitions
photon Tweet Definition of photon Like Definition of photon on Facebook
noun 
  1. (particles) The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.
Translations: 
  • French: photon
  • German: Photon
  • Italian: fotone
Etymology: From photo- + -on.


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