ultrasound

Etymology

ultra- + sound

noun

  1. (physics) Sound with a frequency greater than the upper limit of human hearing, which is approximately 20 kilohertz.
  2. (medicine) The use of ultrasonic waves for diagnostic or therapeutic purposes.
    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. 1991, Stephen King, Needful Things

verb

  1. (transitive, intransitive) To treat with ultrasound.

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