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infrasound ['ɪnfrəsaʊnd] n
el., acoust. 超低周波音 (ちょう・ていしゅうは・おん)
n infrasound | n ['ɪnfrəsaʊnd] n
gen. 空振 (as produced by volcanic activity); 空震 (as produced by volcanic activity)
 English thesaurus
infrasound ['ɪnfrəsaʊnd] n
mil. Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles