One of the mysteries of the English language finally explained.
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).
1960s; earliest use found in Acta Physiologica et Pharmacologica Neerlandica. From photo- + plethysmography, after photoplethysmographic.
In this article we explore how to impress employers with a spot-on CV.