Might mean (unverified): Optical fiber directing light transmission.
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We found 2 dictionaries that define the word lightguide:

General (1 matching dictionary)
  1. lightguide: Wiktionary

Tech (1 matching dictionary)
  1. lightguide: Webster's New World Telecom Dictionary

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Definitions from Wiktionary (lightguide)

▸ noun:  (physics) A waveguide used to guide light

Similar:
light wave, lightwave, lightray, waveplate, lightfront, coherent light, lite, light, cavity resonator, photogating, more...

Opposite:
dark guide, shadow guide, obscurity guide

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Similar:
light wave, lightwave, lightray, waveplate, lightfront, coherent light, lite, light, cavity resonator, photogating, more...

Opposite:
dark guide, shadow guide, obscurity guide



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