shrill, high, supersonic, suprasonic, above 20,000 vibrations per second, too high for human ears or hearing.
"ultrasonic." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/ultrasonic>.
ultrasonic. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/ultrasonic
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