adj.
Pronunciation: ˌ in-fr ə - ' red, -( ˌ )frä-, -f ə -
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