Origin of infrasonic
"infrasonic." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/infrasonic>.
infrasonic. (n.d.). Retrieved October 15th, 2018, from http://www.yourdictionary.com/infrasonic
(comparative more infrasonic, superlative most infrasonic)
Sounds that are below the audible hearing range; typically below 10 or 20 Hz. Contrast with ultrasonic.
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