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3 definitions found
 for infrared
From The Collaborative International Dictionary of English v.0.48 :

  Infrared \In`fra*red"\, Infra-red \In`fra-red"\, a. [Infra- +
     red.]
     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.
        [Webster 1913 Suppl. +PJC]
  
     2. relating to, using, or producing infrared radiation.
        [PJC]
  
     3. affected by infrared radiation; as, infrared detector;
        infrared film.
        [PJC]

From WordNet (r) 3.0 (2006) :

  infrared
      adj 1: 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 region of the electromagnetic spectrum;
           electromagnetic wave frequencies below the visible range;
           "they could sense radiation in the infrared" [syn:
           infrared, infrared frequency]
      2: electromagnetic radiation with wavelengths longer than
         visible light but shorter than radio waves [syn: infrared,
         infrared light, infrared radiation, infrared emission]

From The Free On-line Dictionary of Computing (30 December 2018) :

  infrared
  
      (IR) Electromagnetic waves in the frequency
     range just below visible light corresponding to radiated heat.
     IR waves can be generated by a kind of LED and are often
     used for remote controls for televisions etc. and in some
     docking stations.
  
     (1997-01-30)
  

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