
1) Anime International Company 2) Comedy anime and manga 3) Extraterrestrial superhero 4) Gauge boson 5) Gauge boson 6) Image Comic superhero 7) Laser particle 8) Light particle 9) Light quantum 10) Light unit in physics 11) Massless particle 12) Particle of light 13) Particle with zero mass 14) Quantum of visible light 
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1) Lightquantum 2) Neutral particle 
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https://www.crosswordclues.com/clue/photon

(h) quantum; quanta. A discrete packet of energy associated with electromagnetic radiation. Each photon carries energy E proportional to the frequency  of the radiation: E = h, where h is Planck's constant.
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http://antoine.frostburg.edu/chem/senese/101/glossary/p.shtml

A quantum of radiant energy.
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http://jot101.com/2015/05/a-z-of-science-fiction-words/

A quantum of radiant energy.
Found on 
http://www.braeunig.us/space/glossary.htm

A particle of electromagnetic radiation having zero mass.
Found on 
http://www.chemicalglossary.net/definition/1296-Photon

A packet of light or electromagnetic radiation; also called quantum of light
Found on 
http://www.chemistry-dictionary.com/definition/photon.php

A particle with energy equal to a single quanta.  The energy of the particle is proportional to frequency.  Electromagnetic energy may sometimes be considered to be wave-like, and at other times, particle-like.  At frequencies above the millimeter-wave band, the energy is more often considered to be carried by photons, rather than by waves.  The en...
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http://www.coseti.org/glossary.htm

A particle of light that acts as an individual unit of energy.
Found on 
http://www.daviddarling.info/encyclopedia/P/AE_photon.html

A particle of light or, more precisely, a quantum of the electromagnetic field. It has zero rest mass and a spin of 1. Apart from its obvious role as the carrier of virtually all the information that we have so far been able to ascertain about phenomena beyond the solar system (with the exception of...
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http://www.daviddarling.info/encyclopedia/P/photon.html

A particle of light that acts as an individual unit of energy.
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http://www.electromn.com/glossary/p.htm

a quantum of electromagnetic energy hv with some particle-like characteristics, where h is the Planck constant and v the frequency of radiation
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=731-01-02

A quantum of electromagnetic radiation.
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http://www.encyclo.co.uk/local/20474

A packet of light or electromagnetic radiation, also called quantum of light.
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http://www.encyclo.co.uk/local/20728

<physics> A quantum unit of light energy. ... (09 Oct 1997) ... 
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http://www.encyclo.co.uk/local/20973

(fo´ton) a discrete particle (quantum) of radiant energy.
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http://www.encyclo.co.uk/local/21001

A particle of light that acts as an individual unit of energy.
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http://www.encyclo.co.uk/local/21690
 (hν, γ)
(hν, γ) Type: Term Pronunciation: fō′ton Definitions: 1. In physics, a corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.
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http://www.medilexicon.com/medicaldictionary.php?t=68639

A discrete unit of radiant energy.
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http://www.physicalgeography.net/physgeoglos/p.html

A photon is a light quantum, that is a definite amount of radiation having a frequency within the visible spectrum. A photon is emitted from an excited atom when one of the orbital electrons, having been transferred to an orbit of higher energy level, suddenly returns to its former orbit.
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http://www.probertencyclopaedia.com/browse/GP.HTM

A particle of light composed of a minute quantity of electromagnetic energy.
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http://www.seasky.org/astronomy/astronomy-glossary.html

. A representative of the quantum nature of light. It is considered as the smallest unit of light. 
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http://www.zoo.co.uk/~z0001325/Glossary.html

A discrete quantity of electromagnetic energy. Short wavelength (high frequency) photons carry more energy than long wavelength (low frequency) photons. See Electromagnetic Radiation.
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https://www.encyclo.co.uk/local/20087
 noun
 noun a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle
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https://www.encyclo.co.uk/local/20974

A particle of light that acts as an individual unit of energy.
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https://www.encyclo.co.uk/local/22819
  No exact match found.