sky wave

American  

noun

Radio.

1. a radio wave propagated upward from earth, whether reflected by the ionosphere or not.

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sky wave British  

noun

1. a radio wave reflected back to the earth by the ionosphere ( ionospheric wave ), permitting transmission around the curved surface of the earth Compare ground wave

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Etymology

Origin of sky wave

First recorded in 1925–30

Example Sentences

To the right surge up against the bright morning sky, wave beyond wave, an endless succession of green sunny slopes which might pass for the "Delectable Mountains" of Bunyan.

From Lippincott's Magazine of Popular Literature and Science, Volume 22. October, 1878. by Various