Infrared Definition

ĭnfrə-rĕd
adjective
Designating or of those invisible rays just beyond the red end of the visible spectrum: their waves are longer than those of the spectrum colors but shorter than radio waves, and have a penetrating heating effect: used in cooking, photography, etc.
Webster's New World
Generating, using, or sensitive to infrared radiation.
American Heritage
noun

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

Wiktionary
Infrared light or the infrared part of the spectrum.
American Heritage
Synonyms:
infrared emissioninfrared-radiationinfrared lightinfrared frequency
other

See IR.

Webster's New World Telecom
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Origin of Infrared

  • Latin infra, below, + red

    From Wiktionary

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infrared