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far-infrared radiation

[fahr-in-fruh-red] /ˈfɑr ɪn frəˈrɛd/
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] /ˈfɑrˈrɛd/ (Show IPA). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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far-infrared radiation in Science
far-infrared radiation
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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