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doc Definition of plethysmograph
    English to English
    noun
  • a measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains)
  • source: WordNet 3.0
  • An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb.
  • source: Webster 1913
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