convertase

The story

1. Proto-Indo-European*ḱe?
2. Proto-Indo-European*ḱóm
3. Proto-Italic*kom
4. Proto-Italic*kom-
5. Proto-Indo-European*wert-
6. Proto-Indo-European*wértetor
7. Proto-Italic*wertō
8. Proto-Italic*komwertō
9. Latinconvertō
10. Old Frenchconvertir
11. Middle Englishconverten
12. Englishconvert
13. Proto-Indo-European*dwóh₁
14. Proto-Indo-European*trísinflu.
15. Proto-Indo-European*dwís
16. Ancient Greekδιά (diá)
17. Ancient Greekδῐᾰ- (dĭă-)
18. Proto-Indo-European*steh₂-
19. Proto-Indo-European*stísteh₂ti
20. Proto-Hellenic*hístāmi
21. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
22. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
23. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
24. Englishdiastase
25. English todayconvertase

From convert + -ase.