luciferase

The story

1. Proto-Indo-European*lewk-
2. Proto-Indo-European*léwks
3. Proto-Italic*louks
4. Latinlūx
5. Proto-Indo-European*bʰer-
6. Proto-Indo-European*bʰorós
7. Latinlūcifer
8. Englishluciferin
9. Proto-Indo-European*dwóh₁
10. Proto-Indo-European*trísinflu.
11. Proto-Indo-European*dwís
12. Ancient Greekδιά (diá)
13. Ancient Greekδῐᾰ- (dĭă-)
14. Proto-Indo-European*steh₂-
15. Proto-Indo-European*stísteh₂ti
16. Proto-Hellenic*hístāmi
17. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
18. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
19. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
20. Englishdiastase
21. English todayluciferase

From luciferin + -ase.