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photophobia
photophobic
photophore
photophoresis
photophosphorylation
photopia
photopigment
photopolymer
photopositive
photorealism
photoreception
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photon
pho·ton [ fṓ tòn ] (plural pho·tons)


noun 
Definition:
 
quantum of electromagnetic radiation: a quantum of visible light or other form of electromagnetic radiation demonstrating both particle and wave properties. A photon has neither mass nor electric charge but possesses energy and momentum.

pho·ton·ic [ fō tónnik ] adjective
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