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photon
☆
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
Related Forms:
- photonic adjective
See photon in American Heritage Dictionary 4
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