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| in·fra·red [ ìnfrə réd ] |
noun |
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portion of invisible spectrum: the portion of the invisible electromagnetic spectrum consisting of radiation with wavelengths in the range 750 nm () to 1 mm (), between light and radio waves
 infrared radiation
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adjective |
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of infrared radiation: using, producing, or affected by infrared radiation
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| [Late 19th century. Because it lies below the red end of the visible spectrum] |
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