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ultrasound: Meaning and Definition of

ul•tra•sound

Pronunciation: (ul'tru-sound"), [key]
— n.
  1. sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing.
  2. the application of ultrasonic waves to therapy or diagnostics, as in deep-heat treatment of a joint or imaging of internal structures. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
ultrasonography ultrastructure
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