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3 definitions found

From: Network Terminology

 infrared
 紅外線

From: Webster's Revised Unabridged Dictionary (1913)

 In·fra·red, In·fra-red a.
 1. Physics Lying outside the visible spectrum at its red end; -- said of rays having a longer wavelength (and thus less refrangible) than the extreme red rays, specifically those electromagnetic waves having a wavelength of between 700 nanometers and 1 millimeter.
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From: WordNet (r) 2.0

 infrared
      adj : having or employing wavelengths longer than light but
            shorter than radio waves; lying outside the visible
            spectrum at its red end; "infrared radiation";
            "infrared photography"
      n 1: the infrared part of the electromagnetic spectrum;
           electromagnetic wave frequencies below the visible
           range; "they could sense radiation in the infrared"
           [syn: infrared frequency]
      2: electromagnetic radiation with wavelengths longer than
         visible light but shorter than radio waves [syn: infrared
          light, infrared radiation, infrared emission]