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ultra- +‎ sound

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ultrasound (countable and uncountable, plural ultrasounds)

  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.
    • 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.

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ultrasound (third-person singular simple present ultrasounds, present participle ultrasounding, simple past and past participle ultrasounded)

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

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