"Plethysmograph" is a word in ENGLISH

plethysmograph ENGLISH
Definition:

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.

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The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood …

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