ˈ ̷ ̷ ¦ ̷ ̷ adjective
1. : lying in the part of the infrared spectrum farthest from the red — used of radiations with wavelengths between 30 and about 1000 microns
2. : lying in the part of the infrared spectrum nearest to the red — used of radiations with wavelengths starting at about .8 micron