Electromagnetic Spectrum Definition
    noun
  
 The complete range of frequencies of electromagnetic waves from the lowest to the highest, including, in order, radio, infrared, visible light, ultraviolet, X-ray, and gamma ray waves.
 Webster's New World 
Other Word Forms of Electromagnetic Spectrum
Noun
Singular:
 electromagnetic spectrumPlural:
 electromagnetic-spectraElectromagnetic Spectrum Is Also Mentioned In
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