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phonocatheter

(fō′nō-kăthĭ-tər)
n.
  1. A cardiac catheter with a miniature microphone in its tip used in recording sounds and murmurs from within the heart and large blood vessels.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.