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extraordinary wave

noun, Radio.
1.
(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.
Also called X-wave.
Compare ordinary wave.
Origin
1880-1885
1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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