infrared

Noun
  1. The infrared region of the electromagnetic spectrum;
    Electromagnetic wave frequencies below the visible range (synset 105063962)
    "they could sense radiation in the infrared"
    is a type of: frequence, frequency, oftenness - the number of occurrences within a given time period
    is a part of: infrared spectrum - the spectrum of infrared radiation
    same as: infrared frequency
  2. Electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves (synset 111489881)
    is a type of: actinic radiation, actinic ray - electromagnetic radiation that can produce photochemical reactions
    same as: infrared emission, infrared light, infrared radiation
Adjective
  1. Having or employing wavelengths longer than light but shorter than radio waves;
    Lying outside the visible spectrum at its red end (synset 302528056)
    "infrared radiation"; "infrared photography"
    similar to: invisible, unseeable - impossible or nearly impossible to see; imperceptible by the eye

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