Infrasound



[in-fruh-sound] /ˈɪn frəˌsaʊnd/

noun
1.
with frequencies below the audible range.
/ˈɪnfrəˌsaʊnd/
noun
1.
soundlike waves having a frequency below the audible range, that is, below about 16Hz
infrasound
(ĭn’frə-sound’)
Sound whose wave frequency is too low (under 15-20 hertz) to be heard by humans. Some animals, such as elephants and whales, emit calls at infrasound frequencies. See Note at ultrasound.

infrasonic adjective

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