Main Entry: in·fra·red

Pronunciation: \ˌin-frə-ˈred, -(ˌ)frä-, -fə-\

Function: adjective

Date: 1881

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