pentazole

The story

1. Proto-Indo-European*pénkʷe
2. Proto-Hellenic*pénkʷe
3. Ancient Greekπέντε (pénte)
4. Ancient Greekπεντᾰ- (pentă-)
5. Englishpenta-
6. Proto-Indo-European*né
7. Proto-Indo-European*n̥-
8. Proto-Hellenic*ə-
9. Ancient Greekᾰ̓- (ă-)
10. Proto-Indo-European*gʷeyh₃-
11. Proto-Indo-European*gʷih₃wós
12. Proto-Indo-European*gʷíh₃weti
13. Proto-Hellenic*gʷyṓw-ō
14. Proto-Hellenic*d͏̌ṓwō
15. Ancient Greekζώω (zṓō)
16. Ancient Greekζῶ (zô)
17. Ancient Greekζωή (zōḗ)
18. Frenchazote
19. Englishazote
20. Englishazo-
21. Englishazole
22. English todaypentazole

From penta- + azole.