polymerase

The story

1. Proto-Indo-European*pleh₁-
2. Proto-Indo-European*polh₁ús
3. Ancient Greekπολῠ́ς (polŭ́s)
4. Englishpoly-
5. Proto-Indo-European*(s)mer-
6. Proto-Indo-European*(s)méros
7. Proto-Hellenic*(h)méros
8. Ancient Greekμέρος (méros)
9. Englishpolymer
10. Proto-Indo-European*dwóh₁
11. Proto-Indo-European*trísinflu.
12. Proto-Indo-European*dwís
13. Ancient Greekδιά (diá)
14. Ancient Greekδῐᾰ- (dĭă-)
15. Proto-Indo-European*steh₂-
16. Proto-Indo-European*stísteh₂ti
17. Proto-Hellenic*hístāmi
18. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
19. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
20. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
21. Englishdiastase
22. English todaypolymerase

From polymer + -ase.