short·wave 
/ˈʃoɚtˌweɪv/ noun
plural short·waves /ˈʃoɚtˌweɪv/ noun [count] 1 : a radio wave with a wavelength between 10 and 100 meters 2 : a radio or receiver that uses shortwaves
— shortwave adjective always used before a noun
▪ shortwave frequencies ▪ a shortwave radio/receiver
▪ shortwave frequencies ▪ a shortwave radio/receiver
