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infrasound

['ɪnfrəsaʊnd] n
techn. 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] n
envir. Infraschall m
 Anglais glossaire
infrasound ['ɪnfrəsaʊnd] n
milit. Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles