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ultrasonic vs. ultrasound

[ uhl-truh-son-ik ]
  1. of, relating to, or utilizing ultrasound.
[ uhl-truh-sound ]
  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.

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