plethysmograph

Noun
  1. 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) (synset 103972657)
    is a type of: measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
    subtypes:
    • body plethysmograph - plethysmograph consisting of a chamber surrounding the entire body; used in studies of respiration
    • digital plethysmograph - plethysmograph applied to a digit of the hand or foot to measure skin blood flow

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