# photoplethysmograph

> English word · Noun

## Definitions
1. A plethysmograph that uses illumination of the skin in order to measures changes in light absorption

## Etymology
From photo- + plethysmograph.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/photoplethysmograph