1in·fra·red adj \ˌin-frə-ˈred\
: lying outside the visible spectrum at its red end—used of radiation having a wavelength between about 700 nanometers and 1 millimeter
: relating to, producing, or employing infrared radiation <infrared therapy>
Seen & Heard
What made you want to look up infrared? Please tell us where you read or heard it (including the quote, if possible).