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infrasound

['ɪnfrəsaʊnd] сущ.
тех. Infraschall m
infrasound Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz ['ɪnfrəsaʊnd] сущ.
окруж. Infraschall m
 Английский тезаурус
infrasound ['ɪnfrəsaʊnd] сущ.
воен. Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles