infrasound
noun
in·fra·sound
ˈin-frə-ˌsau̇nd 
: a wave phenomenon of the same physical nature as sound but with frequencies below the range of human hearing compare ultrasound sense 1
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“Infrasound.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/infrasound. Accessed 25 Apr. 2024.
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