proteasome

The story

1. Englishprote(in)
2. Proto-Indo-European*dwóh₁
3. Proto-Indo-European*trísinflu.
4. Proto-Indo-European*dwís
5. Ancient Greekδιά (diá)
6. Ancient Greekδῐᾰ- (dĭă-)
7. Proto-Indo-European*steh₂-
8. Proto-Indo-European*stísteh₂ti
9. Proto-Hellenic*hístāmi
10. Ancient Greekῐ̔́στημῐ (hĭ́stēmĭ)
11. Ancient Greekδῐῐ̈́στημῐ (dĭĭ̈́stēmĭ)
12. Ancient Greekδῐᾰ́στᾰσῐς (dĭắstăsĭs)
13. Englishdiastase
14. Englishprotease
15. Proto-Indo-European*tewh₂-
16. Proto-Indo-European*twoH-mn̥
17. Proto-Hellenic*twṓmə?
18. Proto-Indo-European*styeH-
19. Proto-Indo-European*(s)tyoH-mn̥
20. Proto-Hellenic*styṓmə?
21. Ancient Greekσῶμα (sôma)
22. English todayproteasome

From protease + -some.