shortwave

1. An electromagnetic wave with a relatively short wavelength; specifically, one with a wavelength generally between 10 and 100 metres, corresponding to a frequency between 3 and 30 megahertz.

   Shortwaves are longer than microwaves.

2. An electromagnetic wave with a relatively short wavelength; specifically, one with a wavelength generally between 10 and 100 metres, corresponding to a frequency between 3 and 30 megahertz.

   Downward radiation in the shortwave (noun sense 1) frequency range which enters the Earth's atmosphere.

3. A waveband comprising radio waves in the shortwave (noun sense 1) frequency range, especially when used in broadcasting.

   Many stations broadcast on shortwaves.

4. In full shortwave radio: a radio which is able to receive radio waves in the shortwave (noun sense 1) waveband.

1. Tom listens to the news on a shortwave radio.

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