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