infrasonic

[ in-fruh-son-ik ]

/ ˌɪn frəˈsɒn ɪk /

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adjective

noting or pertaining to a sound wave with a frequency below the audio-frequency range.

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Origin of infrasonic

First recorded in 1925–30; infra- + sonic

Such low frequencies, below 20 Hertz, are known as infrasonic notes.
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