Far-infrared radiation
[fahr-in-fruh-red] /ˈfɑr ɪn frəˈrɛd/
noun
1.
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.
far-infrared radiation
(fär’ĭn’frə-rěd’)
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.
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