adj. designating or of a frequency of mechanical vibrations below the range audible to the human ear; below sixteen vibrations per second
Pain in his ear drum led to his study of infrasonic waves.
Pain in his ear drum led to his study of infrasonic waves.
Hear it
inaudible; unhearable;frequency below the audio-frequencyrange
audible; hearable
4 syllables
in-fra-son-ic
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