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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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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use infrasonic in a sentence
Such low frequencies, below 20 Hertz, are known as infrasonic notes.