immunocytofluorescence

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. Ancient Greekκύτος (kútos)
15. Englishcyto-
16. Proto-Indo-European*bʰel-
17. Proto-Indo-European*bʰlewH-
18. Proto-Indo-European*bʰluH-yé-ti?
19. Latinfluō
20. Latinfluor
21. Englishfluor
22. Englishfluorite
23. Middle Low Germanspar
24. Old Englishspærstān
25. Middle Englishsparston
26. Englishsparstonebf.
27. Englishspar
28. Englishfluorspar
29. Englishfluorescence
30. English todayimmunocytofluorescence

From immuno- + cyto- + fluorescence.