Definition of "ultrasound"

ultrasound

noun
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.
  Quotations
  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
third-person singular simple present ultrasounds, present participle ultrasounding, simple past and past participle ultrasounded
1. (transitive, intransitive) To treat with ultrasound.