The story
- Proto-Indo-European*ser-?
- Proto-Indo-European*srew-
- Proto-Indo-European*sréweti
- Proto-Hellenic*hréwō
- Ancient Greekῥέω (rhéō)
- Englishrheo-
- Proto-Indo-European*ḱerd-
- Proto-Indo-European*ḱḗr
- Proto-Indo-European*ḱr̥díyeh₂
- Proto-Hellenic*kərdíyā
- Ancient Greekκαρδία (kardía)
- Englishcardio-
- Proto-Indo-European*gerbʰ-
- Proto-Hellenic*grə́pʰō
- Ancient Greekγρᾰ́φω (grắphō)
- Ancient Greekγράμμα (grámma)
- Englishcardiogram
- English todayrheocardiogram
From rheo- + cardiogram.
Etymology from Wiktionary, CC BY-SA 4.0.