photon

[foh-ton]
noun
a quantum of electromagnetic radiation, usually considered as an elementary particle that is its own antiparticle and that has zero rest mass and charge and a spin of one. Symbol: γ
Also called light quantum.


Origin:
1900–05; phot- + -on1

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World English Dictionary
photon (ˈfəʊtɒn)
 
n
a quantum of electromagnetic radiation, regarded as a particle with zero rest mass and charge, unit spin, and energy equal to the product of the frequency of the radiation and the Planck constant

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Etymonline
Word Origin & History

photon
"unit of electromagnetic radiation," 1926, from photo- "light" + on "unit."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

photon pho·ton (fō'tŏn')
n.
The quantum of electromagnetic energy, generally regarded as a discrete particle having zero mass, no electric charge, and an indefinitely long lifetime.


pho·ton'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
photon   (fō'tŏn')  Pronunciation Key 
The subatomic particle that carries the electromagnetic force and is the quantum of electromagnetic radiation. The photon has a rest mass of zero, but has measurable momentum, exhibits deflection by a gravitational field, and can exert a force. It has no electric charge, has an indefinitely long lifetime, and is its own antiparticle. See Note at electromagnetic radiation. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
photon [(foh-ton)]

The quantum, or bundle of energy, in which light and other forms of electromagnetic radiation are emitted. (See atom.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The state of one of these photons was inextricably linked with that of the
  other through a process known as quantum entanglement.
Light itself is made up of particles called photons.
The electrons and photons used for data processing are certainly part of their
  realm.
These are tiny particles that have a crystal structure which influences the
  flow of photons, the particles of light.
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