radioimmunodiagnosis

The story

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

From radio- + immunodiagnosis.