shortwave

[shawrt-weyv]

noun

Electricity. a radio wave shorter than that used in AM broadcasting, corresponding to frequencies of over 1600 kilohertz: used for long-distance reception or transmission.
shortwave radio.
Physics. a wave of electromagnetic radiation equal in length to, or shorter than, the wavelength of visible light.

adjective

verb (used with or without object), short·waved, short·wav·ing.

Origin of shortwave

First recorded in 1900–05; short + wave

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

There were taxi fleets to be equipped with short-wave radio.
Creatures of the Abyss
Murray Leinster
It wasn't a scientific guy talking, just the short-wave operator.
Creatures of the Abyss
Murray Leinster
Nick abandoned his job and went below to the short-wave set.
Creatures of the Abyss
Murray Leinster
There was no movement ashore, though Nick had talked with the island on short-wave.
Creatures of the Abyss
Murray Leinster
If they were keeping in touch with some of their own people by short-wave—of course they would speak English!
Sign of the Green Arrow
Roy J. (Roy Judson) Snell

in reference to radio wavelength less than c.100 meters, 1907, from short (adj.) + wave (n.).

short-wave in Science

[shôrt′wāv′]

A radio wave with a frequency between 5.9 megahertz and 26.1 megahertz. Shortwaves broadcast from the Earth's surface are reflected by the upper atmosphere and can travel great distances around the planet. The shortwave band of the electromagnetic spectrum is used for amateur radio communications.