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[pluh-thiz-muh-graf, -grahf] /pləˈθɪz məˌgræf, -ˌgrɑf/

a device for measuring and recording changes in the volume of the body or of a body part or organ.
/pləˈθɪzməˌɡrɑːf; -ˌɡræf; -ˈθɪs-/
a device for measuring the fluctuations in volume of a bodily organ or part, such as those caused by variations in the amount of blood it contains

plethysmograph ple·thys·mo·graph (plě-thĭz’mə-grāf’, plə-)
An instrument that measures variations in the size of an organ or body part on the basis of the amount of blood passing through or present in the part.
ple·thys’mo·graph’ic adj.


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