Dictionary

electromagnetic spectrum

noun

Definition of ELECTROMAGNETIC SPECTRUM

:  the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light

First Known Use of ELECTROMAGNETIC SPECTRUM

circa 1934

electromagnetic spectrum

noun    (Medical Dictionary)

Medical Definition of ELECTROMAGNETIC SPECTRUM

:  the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light

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