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sky wave

American  

noun

Radio.

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

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of sky wave

First recorded in 1925–30

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.