photoplethysmography
/ˌfəʊtəʊplɛθɪzˈmɒɡrəfi/Medicine
noun
Measurement of blood flow or blood pressure by optical means (typically involving measurement of changes in the transmission or scattering of light created by blood flow in a part of the body).
Origin
1960s; earliest use found in Acta Physiologica et Pharmacologica Neerlandica. From photo- + plethysmography, after photoplethysmographic.
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