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Dictionary

pho•ton

Pronunciation: (fō'ton), [key]
—n.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

photomural

photonegative

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