1. The infrared region of the electromagnetic spectrum;
    Electromagnetic wave frequencies below the visible range (synset 105063962)
    "they could sense radiation in the infrared"
  2. Electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves (synset 111489881)
  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"

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