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English definition of “ultrasonic”

ultrasonic

adjective     /ˌʌl.trəˈsɒn.ɪk/ US  /-ˈsɑː.nɪk/
describes sound that is too high for people to hear Sound and its properties
(Definition of ultrasonic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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