AskDefine | Define photon

Dictionary Definition

photon n : a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle

User Contributed Dictionary

English

Etymology

From photo- + -on.

Pronunciation

/ˈfəʊtɒn/

Noun

  1. The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.

Derived terms

Translations

See also

Synonyms, Antonyms and Related Words

ASA scale, British candle, Hefner candle, Kern, NMR, Scheiner scale, X ray, actinic ray, actinism, alpha particle, antibaryon, antilepton, antimeson, atomerg, atomic beam, atomic nucleus, atomic particle, atomic ray, baryon, beam, beam of light, beta particle, bougie decimale, calorie, candle, candle lumen, candle power, candle-foot, candle-hour, candle-meter, decimal candle, dinamode, dyne, electron, elementary particle, energid, erg, exposure meter, flux, foot-candle, foot-pound, gamma ray, gleam, horsepower-hour, horsepower-year, infrared ray, intensity, international candle, invisible radiation, joule, kilogram-meter, kilowatt-hour, lamp-hour, leam, lepton, light, light meter, light quantum, lumen, lumen meter, lumen-hour, lumeter, luminous flux, luminous intensity, luminous power, lux, meson, neutron, nuclear force, nuclear magnetic resonance, nuclear particle, nuclear resonance, nucleon, nucleosynthesis, nucleus, patch, pencil, proton, quantum, radiation, radiorays, ray, ray of light, ribbon, ribbon of light, solar rays, strangeness, streak, stream, stream of light, streamer, strong interaction, triton, ultraviolet ray, unit of flux, unit of light, valence electron, violet ray
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