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infrasound ['ɪnfrəsaʊnd] n
environ.	poddźwięk (drgania powietrza o częstotliwościach zbyt niskich by człowiek mógł je odbierać jako dźwięk; Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz)
phys.	infradźwięk m
English thesaurus
infrasound ['ɪnfrəsaʊnd] n
mil.	Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles