far-infrared

adjective
far-in·fra·red | \ˈfär-ˌin-frə-ˈred \

Definition of far-infrared 

: of or relating to the longer wavelengths of radiation in the infrared spectrum and especially to those between 10 and 1000 micrometers

First Known Use of far-infrared

1923, in the meaning defined above

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The first known use of far-infrared was in 1923

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