clinicobacteriological

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 Greekβακτηρία (baktēría)
13. Ancient Greekβακτήριον (baktḗrion)
14. New Latinbactērium
15. Englishbacterio-
16. Proto-Indo-European*leǵ-
17. Proto-Indo-European*lóǵos
18. Proto-Hellenic*lógos
19. Ancient Greekλόγος (lógos)
20. Proto-Indo-European*h₂el-
21. Proto-Indo-European*h₂élisder.?
22. Englishbacteriological
23. English todayclinicobacteriological

From clinico- + bacteriological.