https://en.oxforddictionaries.com/definition/photon
photon
NOUN
Physics
-
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
Origin
Early 20th century: from Greek phōs, phōt- ‘light’, on the pattern of electron.
Pronunciation
photon
/ˈfəʊtɒn/
