dehydrogenase

The story

1. Proto-Indo-European*de
2. Proto-Indo-European*déh₁
3. Proto-Italic*dē
4. Latindē
5. Latindē-
6. Englishde-
7. Proto-Indo-European*wed-
8. Proto-Indo-European*wódr̥
9. Proto-Hellenic*údōr
10. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
11. Ancient Greekὑδρο- (hudro-)
12. Frenchhydro-
13. Proto-Indo-European*ǵenh₁-
14. Proto-Indo-European*ǵénh₁os
15. Proto-Hellenic*génos
16. Ancient Greekγένος (génos)
17. Frenchhydrogène
18. Englishhydrogen
19. Proto-Indo-European*dwóh₁
20. Proto-Indo-European*trísinflu.
21. Proto-Indo-European*dwís
22. Ancient Greekδιά (diá)
23. Ancient Greekδῐᾰ- (dĭă-)
24. Proto-Indo-European*steh₂-
25. Proto-Indo-European*stísteh₂ti
26. Proto-Hellenic*hístāmi
27. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
28. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
29. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
30. Englishdiastase
31. English todaydehydrogenase

From de- + hydrogen + -ase.