photon

Noun
  1. A quantum of electromagnetic radiation;
    An elementary particle that is its own antiparticle (synset 109414116)
    is a type of: gauge boson - a particle that mediates the interaction of two elementary particles
    is a part of: electromagnetic radiation, electromagnetic wave, nonparticulate radiation - radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge

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