plethysmograph

/pləˈθɪzməˌgræf/
IPA guide

Definitions of plethysmograph
  1. 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)
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    types:
    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
    type of:
    measuring device, measuring instrument, measuring system
    instrument that shows the extent or amount or quantity or degree of something
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