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'Ultrasound' is sound with a frequency greater than the upper limit of human hearing.
'Ultrasound' may also refer to:

★ Medical ultrasonography, an ultrasound-based diagnostic imaging technique

★ The Ultrasonics, a dance band

★ Ultrasound (band), a rock band

★ Gravis Ultrasound, a sound card for the PC
'Ultrasonic' is an adjective referring to ultrasound and may also refer to:

★ Ultrasonics, a trade term for the use of high-intensity acoustic energy to change materials