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- (physics) Sound with a frequency greater than the upper limit of human hearing, which is approximately 20 kilohertz.
- (medicine) The use of ultrasonic waves for diagnostic or therapeutic purposes.
- 1991, Stephen King, Needful Things:
- Ultrasound as a treatment for degenerative arthritis was in its infancy. It might eventually turn out to be as effective as the Salk vaccine, or as bogus as the science of phrenology.
- (physics): infrasound
use of ultrasound