Definition of plethysmograph in English:
 plethysmograph
noun plɪˈθɪzməɡrɑːfpləˈTHizməˌɡraf
Medicine An instrument for recording and measuring variation in the volume of a part of the body, especially as caused by changes in blood pressure.
 Example sentencesExamples
-  Lennox and coworkers found that drift of an inductive plethysmography signal was only 22% of the drift arising from changes in temperature within a body plethysmograph.
 -  Thus, the flows estimated in a body plethysmograph may not be fully available to the flow-limited subject.
 -  Lung volumes were measured in a whole-body plethysmograph, and data were expressed as a percent of the predicted values published by Goldman and Becklake.
 -  Functional respiratory variables in the animal models were measured with a double-chamber plethysmograph as described.
 -  Hulskamp and coworkers measured lung volume with a new plethysmograph in 32 healthy infants.
 
Derivatives
  
adjective 
Medicine  Before and after training, spirometry, plethysmographic lung volumes, and carbon monoxide diffusing capacity were assessed.
 Example sentencesExamples
-  Baseline specific airways conductance and airway responsiveness to histamine were measured using a non invasive body plethysmographic technique.
 -  The pulse oximeter also utilizes a plethysmographic waveform to differentiate pulsatile arterial hemoglobin saturation from venous blood.
 -  In contrast to findings in healthy adults and older children, in whom results are very similar, plethysmographic lung volumes in infants have been consistently higher than those obtained by gas dilution.
 -  These animal plethysmographic data are consistent with results from a large multicenter clinical study that demonstrated a high incidence of airway obstruction in sickle cell patients.
 
Origin
  
Late 19th century: from Greek plēthusmos 'enlargement' (based on plēthus 'fullness') + -graph.