The story
- Proto-Indo-European*ḱerd-
- Proto-Indo-European*ḱḗr
- Proto-Indo-European*ḱr̥díyeh₂
- Proto-Hellenic*kərdíyā
- Ancient Greekκαρδία (kardía)
- Englishcardio-
- Proto-Indo-European*ǵneh₃-
- Proto-Indo-European*ǵneh₃tis
- Ancient Greekγνῶσῐς (gnôsĭs)
- Englishgnosis
- English todaycardiognosis
Etymology from Wiktionary, CC BY-SA 4.0.