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Dictionary

ul•tra•sound

Pronunciation: (ul'tru-sound"), [key]
—n.
1. Physics.sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing.
2. Med.the application of ultrasonic waves to therapy or diagnostics, as in deep-heat treatment of a joint or imaging of internal structures. Cf. ultrasonography.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

ultrasonography

ultrastructure

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