photon

photon
   1. a quantum of light energy, or, more generally, of any form of electromagnetic energy having a single wavelength, direction, and polarization.
   2. a former name for the unit of retinal illuminance now called the troland.

Dictionary of units of measurement. 2015.

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  • photon — ► NOUN Physics ▪ a particle representing a quantum of light or other electromagnetic radiation. DERIVATIVES photonic adjective …   English terms dictionary

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