nonfluorescent

The story

1. Proto-Indo-European*né
2. Proto-Germanic*ne
3. Proto-Indo-European*ís?
4. Proto-Indo-European*h₁óynos
5. Proto-Germanic*ainaz
6. Proto-Germanic*nainaz
7. Proto-West Germanic*nain
8. Old Englishnān
9. Middle Englishnon
10. Old Englishnān
11. Old Englishnān-
12. Middle Englishnon-
13. Englishnon-
14. Proto-Indo-European*bʰel-
15. Proto-Indo-European*bʰlewH-
16. Proto-Indo-European*bʰluH-yé-ti?
17. Latinfluō
18. Latinfluor
19. Englishfluor
20. Englishfluorite
21. Middle Low Germanspar
22. Old Englishspærstān
23. Middle Englishsparston
24. Englishsparstonebf.
25. Englishspar
26. Englishfluorspar
27. Englishfluorescencebf.
28. Englishfluoresce
29. Englishfluorescent
30. English todaynonfluorescent

From non- + fluorescent.