ultrasound ( synonym found)
Definition of ultrasound:

(n) : sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz; the use of ultrasonic waves for diagnostic or therapeutic purposes
Definition of ultrasound:

(n) : sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz; the use of ultrasonic waves for diagnostic or therapeutic purposes
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