hyperautofluorescent

The story

1. Proto-Indo-European*úp
2. Proto-Indo-European*upér
3. Proto-Hellenic*hupér
4. Ancient Greekῠ̔πέρ (hŭpér)
5. Ancient Greekῠ̔περ- (hŭper-)
6. Englishhyper-
7. Proto-Indo-European*h₂ew
8. Proto-Indo-European*tó-
9. Proto-Hellenic*autós
10. Proto-Indo-European*h₂ew
11. Ancient Greekαὖ (aû)
12. Ancient Greekτόν (tón)
13. Ancient Greekαὐτός (autós)
14. Ancient Greekαὐτο- (auto-)
15. Englishauto-
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. Englishfluorescencebf.
30. Englishfluoresce
31. Englishfluorescent
32. Englishautofluorescent
33. English todayhyperautofluorescent

From hyper- + autofluorescent.