Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Ultrasonic sound.
  • n. Medicine The use of ultrasonic waves for diagnostic or therapeutic purposes, specifically to image an internal body structure, monitor a developing fetus, or generate localized deep heat to the tissues.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz
  • n. The use of ultrasonic waves for diagnostic or therapeutic purposes

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs
  • n. very high frequency sound; used in ultrasonography

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