infrared
in-fra-red
noun
Electromagnetic radiation with wavelengths longer than visible red light, used in various technologies.
"Remote controls transmit infrared signals."
adjective
Relating to electromagnetic radiation with wavelengths longer than visible red light.
"Infrared cameras can see in the dark."
Thesaurus
Synonyms: infrared frequency, infrared light, infrared emission, infrared radiation, unseeable, invisible