Wordnet polsko-angielski 
                         (a radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz) ) 
long wave 
Słownik morski polsko-angielski Iwona Kienzler
                        long sea
 (a radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz) ) 
long wave 
long sea