far infrared radiation

far-infrared radiation

the longer wavelengths of electromagnetic radiation in the infrared region of the spectrum, beyond the red end of the visible spectrum, from 50 to 1000 micrometers. Abbreviation: FIR
Also called far-red radiation, [fahr-red]
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American Heritage
Science Dictionary
far-infrared radiation   (fär'ĭn'frə-rěd')  Pronunciation Key 
Infrared electromagnetic radiation of very long wavelengths, in the range of 2-50 microns. It is used in medicine to provide a penetrating heat to the body. Also called far-red radiation.
The American Heritage® Science Dictionary
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