clinicopathologically

The story

1. Proto-Indo-European*ḱel-
2. Proto-Indo-European*ḱley-
3. Proto-Indo-European*ḱl̥néyti
4. Proto-Hellenic*klíňňō
5. Ancient Greekκλῑ́νω (klī́nō)
6. Ancient Greekκλῑ́νη (klī́nē)
7. Ancient Greekκλῑνῐκός (klīnĭkós)
8. Late Latinclīnicus
9. Frenchclinique
10. Englishclinic
11. Englishclinico-
12. Ancient Greekπάσχω (páskhō)
13. Ancient Greekπᾰ́θος (pắthos)
14. Proto-Indo-European*leǵ-
15. Proto-Indo-European*lóǵos
16. Proto-Hellenic*lógos
17. Ancient Greekλόγος (lógos)
18. Frenchpathologie
19. Englishpathology
20. Proto-Indo-European*h₂el-
21. Proto-Indo-European*h₂élisder.?
22. Englishpathological
23. Englishclinico-
24. Englishpathology
25. Englishclinicopathology
26. Englishclinicopathological
27. Englishclinico-
28. Ancient Greekπᾰ́θος (pắthos)
29. Ancient Greekπαθολογίᾱ (pathologíā)
30. Ancient Greekπᾰθολογῐκός (păthologĭkós)
31. Englishpathologic
32. Englishclinicopathology
33. Englishclinicopathologic
34. Proto-Indo-European*leyg-
35. Proto-Germanic*līką
36. English todayclinicopathologically

From clinicopathological + -ly, or from clinicopathologic + -ally.