photon
photon definition
☆ pho·ton (fō′tän′)
noun
- Particle Physics a subatomic particle, having energy and momentum but no mass or electric charge, that is the quantum unit of electromagnetic radiation, including light
- a unit of retinal illumination equal to the illumination from a surface having a brightness of one candle per sq meter seen through a pupil area of one sq millimeter
Etymology: phot(o)- + (electr)on
Related Forms:
- photonic pho·ton′ic adjective
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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