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light spectrum Twit Definition of light spectrum Share Definition of light spectrum on Facebook Digg:Definition of light spectrum! stumble Definition of light spectrum Bookmark Definition of light spectrum on Delicious submit Definition of light spectrum to reddit Bookmark Definition of light spectrum
noun 
  1. (physics) the portion of the electromagnetic spectrum that is visible to humans
  2. (physics) an extension of the human-visible spectrum to include near-visible wavelengths, primarily near infrared
Etymology: light (visible) + spectrum (range of electromagnetic wavelengths)

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