Definition of infrared in English:


Syllabification: in·fra·red
Pronunciation: /ˌinfrəˈred


  • 1(Of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.
    More example sentences
    • Terahertz light is a little-studied realm of the electromagnetic spectrum between microwave and infrared light.
    • It isn't hot enough to radiate UV rays but it does radiate in the visible and infrared parts of the electromagnetic spectrum.
    • The sight does not emit visible or infrared light (except from the eyepiece) that can be detected by the enemy.
  • 1.1(Of equipment or techniques) using or concerned with this radiation: infrared cameras
    More example sentences
    • A dozen Army Technical Officers using high speed boats swooped on the Island and made a thorough search of the area using sophisticated infrared equipment.
    • But if that storm clears in time, the jets were going to get out with some infrared equipment and help with the search starting tomorrow.
    • The lights were filmed March 5 by pilots using infrared equipment.


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  • The infrared region of the spectrum; infrared radiation.
    More example sentences
    • Wavelengths of light in this region of the spectrum cause heating so blocking infrared reduces unwanted rays from the sun.
    • But what is so special about water that makes its absorptions extend all the way from the far infrared to the near ultraviolet?
    • By mid-century, inroads were also being made into the near infrared.

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