IPA: /ˈsfɪɡməˌɡræf/
KK: /ˈsfɪɡməˌɡræf/
A device used to create a visual record of the pulse's strength and changes over time.
The doctor used a sphygmograph to monitor the patient's heart rate during the examination.
Sphygmograph → It is formed from "sphygmos" (σφυγμός) (meaning pulse) and "graph" (from Greek "grapho", meaning to write). The word describes a device that writes or records the pulse.
Think of a device that 'writes' ('graph') the 'pulse' ('sphygmos') — that's what a sphygmograph does.