Infrasonic definitions

ĭn'frə-sŏn'ĭk
Generating or using waves or vibrations with frequencies below that of audible sound.
adjective
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Designating or of a frequency of mechanical vibrations below the range audible to the human ear, i.e., below c. sixteen vibrations per second.
adjective
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Infrasonic refers to sound below the audible hearing range; typically under 20 Hz. Contrast with ultrasonic.
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(of sound waves, acoustics) Having frequencies below the human audible range.
adjective
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(of a device) Generating or employing such sound waves.
adjective
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