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Ultrasound is sound with a frequency greater than the upper limit of human hearing (greater than 20 kHz).
Ultrasonic is an adjective referring to ultrasound.
Ultrasound and ultrasonic may also refer to:
- Medical ultrasonography, an ultrasound-based diagnostic imaging technique
- Ultrasonics, shorthand term for any equipment employing ultrasonic principles, also used as a trade term for the use of high-intensity acoustic energy to change materials
- Ultrasonic sensors and transducers which use ultrasound to measure distance and velocity
- Ultrasonic testing, a technique of non-destructive testing
- Ultrasonic cleaning
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