Definition of photoplethysmography in US English:

photoplethysmography

noun

Medicine
  • 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.

Pronunciation

photoplethysmography

/ˌfəʊtəʊplɛθɪzˈmɒɡrəfi/