The story
- Proto-Indo-European*sweh₂gʰ-
- Proto-Hellenic*wākʰā́
- Ancient Greekἠχή (ēkhḗ)
- Ancient Greekἠχώ (ēkhṓ)
- Englishecho-
- 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 Greekγράφω (gráphō)
- Englishcardiograph
- English todayechocardiograph
From echo- + cardiograph.
Etymology from Wiktionary, CC BY-SA 4.0.