Bible Dictionaries
Plethysmograph
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Plethysmograph'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/plethysmograph.html. 1828.