echocardiographical

The story

1. Proto-Indo-European*sweh₂gʰ-
2. Proto-Hellenic*wākʰā́
3. Ancient Greekἠχή (ēkhḗ)
4. Ancient Greekἠχώ (ēkhṓ)
5. Latinēchō
6. Medieval Latinēccō
7. Middle Englisheccho
8. Englishecho
9. Proto-Indo-European*ḱerd-
10. Proto-Indo-European*ḱḗr
11. Proto-Indo-European*ḱr̥díyeh₂
12. Proto-Hellenic*kərdíyā
13. Ancient Greekκαρδία (kardía)
14. Englishcardio-
15. Proto-Indo-European*gerbʰ-
16. Proto-Hellenic*grə́pʰō
17. Ancient Greekγρᾰ́φω (grắphō)
18. Ancient Greekγραφή (graphḗ)
19. Englishcardiography
20. Englishechocardiography
21. Proto-Indo-European*h₂el-
22. Proto-Indo-European*h₂élisder.?
23. English todayechocardiographical

From echocardiograph(y) + -ical.