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far-infrared radiation

[fahr-in-fruh-red]
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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
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Also called far-red radiation [fahr-red] /ˈfɑrˈrɛd/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

far-infrared radiation in Science

far-infrared radiation

[färĭn′frə-rĕd]
  1. 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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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.