Definition of plethysmograph
: an instrument for determining and registering variations in the size of an organ, limb, or part resulting from changes in the amount of blood present or passing through it
From the M-W Editors
Origin and Etymology of plethysmograph
International Scientific Vocabulary, from Greek plēthysmos increase, from plēthynein to increase, from plēthys mass, quantity, from plēthein
Medical Dictionary
plethysmograph
play
noun
ple·thys·mo·graph
\-ˌgraf\
Medical Definition of plethysmograph
: an instrument for determining and registering variations in the size of an organ or limb resulting from changes in the amount of blood present or passing through it
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