immunodiagnosis

The story

1. Proto-Indo-European*mey-
2. Proto-Indo-European*moy-nós
3. Proto-Italic*moinos
4. Latinmūnus
5. Proto-Indo-European*né
6. Proto-Indo-European*n̥-
7. Proto-Italic*n̥-
8. Latinin-
9. Latinin- -is
10. Latinimmūnis
11. Middle Frenchimmun
12. Englishimmune
13. Englishimmuno-
14. Proto-Indo-European*dwóh₁
15. Proto-Indo-European*trísinflu.
16. Proto-Indo-European*dwís
17. Ancient Greekδιά (diá)
18. Ancient Greekδια- (dia-)
19. Proto-Indo-European*ǵneh₃-
20. Proto-Indo-European*ǵn̥h₃sḱéti
21. Proto-Hellenic*gignṓskō
22. Ancient Greekγῐγνώσκω (gĭgnṓskō)
23. Ancient Greekδῐαγῐγνώσκω (dĭagĭgnṓskō)
24. Ancient Greekδῐᾰ́γνωσῐς (dĭắgnōsĭs)
25. Latindiagnōsis
26. Englishdiagnosis
27. English todayimmunodiagnosis

From immuno- + diagnosis.