Dictionary
4 ENTRIES FOUND:

infrared

adjective in·fra·red \ˌin-frə-ˈred, -(ˌ)frä-, -fə-\

: producing or using rays of light that cannot be seen and that are longer than rays that produce red light

Full Definition of INFRARED

1
:  situated outside the visible spectrum at its red end —used of radiation having a wavelength between about 700 nanometers and 1 millimeter
2
:  relating to, producing, or employing infrared radiation <infrared therapy>
3
:  sensitive to infrared radiation <infrared sensors that detect body heat>
infrared noun

First Known Use of INFRARED

1881

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April 27, 2015
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