extraordinary wave
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noun Radio.
(of the two waves into which a radio wave is divided in the ionosphere under the influence of the earth's magnetic field) the wave with characteristics different from those that the undivided wave would have exhibited in the absence of the magnetic field.
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Also called X-wave.
Compare ordinary wave.
Origin of extraordinary wave
First recorded in 1880–85
Words nearby extraordinary wave
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021