hydratase

The story

1. Proto-Indo-European*wed-
2. Proto-Indo-European*wódr̥
3. Proto-Hellenic*údōr
4. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
5. Ancient Greekὑδρο- (hudro-)
6. Frenchhydr-
7. Frenchhydrate
8. Englishhydrate
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 todayhydratase

From hydrate + -ase.