Plethysmograph :: Plethysmograph (n.) 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..

Plethysmography :: Plethysmography (n.) The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood supply..

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