shortwave

noun

1. an electromagnetic wave that is shorter than those used in commercial broadcasting, usually a radio wave 60 meters or less in length
2. a radio or radio band for broadcasting or receiving shortwaves
   in full shortwave radio
3. 1. the band of frequencies (approximately 1.7 to 30 megahertz) used for shortwave transmissions by international broadcasters, licensed amateurs and other operators
   2. the transmissions that are broadcast