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far-infrared radiation

American  
[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. FIR

far-infrared radiation Scientific  
/ fär′ĭn′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.

  2. Also called far-red radiation

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.