SHORT WAVE

radio wave 60 meters or less in length

electromagnetic waves for radio transmissions that are less than 150 meters

Shortwave radio operates between the frequencies of 3 MHz (3,000 kHz) and 30 MHz (30,000 kHz) and came to be referred to as such in the early days of radio because the wavelengths associated with this frequency range were shorter than the long wave lengths widely in use at that time. An alternate name is HF or high frequency radio. Short wavelengths are associated with high frequencies because there is an inverse relationship between frequency and wavelength.
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Noun
1. a radio wave with a wavelength less than 100 meters (a frequency greater than 3 megaHertz)
(hypernym) radio wave, radio emission, radio radiation

short-wave /'ʃɔ:tweiv/
danh từ (rađiô) làn sóng ngắn tính từ (rađiô) sóng ngắnshort-wave radio station: đài phát thanh làn sóng ngắn
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n. คลื่นวิทยุช่วงสั้น (ประมาณ 20-200 เมตร)