cellulase

The story

1. Proto-Indo-European*ḱel-
2. Latincella
3. Latincellula
4. Frenchcellule
5. Proto-Indo-European*h₃ed-
6. Proto-Indo-European*h₃édosder.?
7. Frenchcellulose
8. Englishcellulose
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 todaycellulase

From cellulose + -ase.