esterase

The story

1. Proto-Indo-European*h₂eḱ-
2. Proto-Indo-European*h₂eḱéh₁yeti
3. Proto-Italic*akēō
4. Latinaceō
5. Latinacēscō
6. Latinacētum
7. Proto-West Germanic*aket
8. Proto-West Germanic*atek
9. Old High Germaneȥȥih
10. Middle High Germaneȥȥich
11. GermanEssich
12. GermanEssig
13. Proto-Indo-European*h₂eydʰ-
14. Proto-Hellenic*áitʰō
15. Ancient Greekαἴθω (aíthō)
16. Ancient Greekᾱ̓ήρ (āḗr)influ.?
17. Ancient Greekαἰθήρ (aithḗr)
18. Latinaethēr
19. GermanÄther
20. GermanEster
21. Englishester
22. Proto-Indo-European*dwóh₁
23. Proto-Indo-European*trísinflu.
24. Proto-Indo-European*dwís
25. Ancient Greekδιά (diá)
26. Ancient Greekδῐᾰ- (dĭă-)
27. Proto-Indo-European*steh₂-
28. Proto-Indo-European*stísteh₂ti
29. Proto-Hellenic*hístāmi
30. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
31. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
32. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
33. Englishdiastase
34. English todayesterase

From ester + -ase.