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photostethoscope

(fō′tō-stĕthə-skōp′)
n.
  1. A device that converts sound into flashes of light, used for continuous observation of the fetal heart.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.