infrared

/IH0 N F R ER0 EH1 D/
noun
  1. 1

    Electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm

adjective
  1. 1

    Having the wavelength in the infrared.

  2. 2

    In the infrared spectrum.

Source: https://en.wiktionary.org/wiki/infrared