The story
- Proto-Indo-European*ḱerd-
- Proto-Indo-European*ḱḗr
- Proto-Indo-European*ḱr̥díyeh₂
- Proto-Hellenic*kərdíyā
- Ancient Greekκαρδία (kardía)
- Englishcardio-
- Proto-Indo-European*leǵ-
- Proto-Indo-European*lóǵos
- Proto-Hellenic*lógos
- Ancient Greekλόγος (lógos)
- Englishcardiology
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- English todaycardiological
From cardiology + -ical.
Etymology from Wiktionary, CC BY-SA 4.0.