The story
- Latinradius
- Englishradio-
- 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 todayradiocardiogram
From radio- + cardiogram.
Etymology from Wiktionary, CC BY-SA 4.0.