pho|ton

pho|ton «FOH ton», noun.

a unit particle of light, an element of radiant energy, according to the quantum theory; a light quantum. It has a momentum equal to its energy divided by the velocity of light, and moves as a unit with the velocity of light. It is considered to be one of the elementary particles. »

[Einstein] said that light, in spite of its wave nature, must be composed of energy particles, or photons (Harvey E. White). When you see different colors your eyes are being hit streams of photons which differ in their rates of vibration (Ralph E. Lapp).

╂[< photo- + -on]