pneumoactivate

The story

1. Proto-Indo-European*plew-
2. Proto-Indo-European*pléwmō
3. Ancient Greekπλεύμων (pleúmōn)
4. Ancient Greekπνέω (pnéō)influ.
5. Ancient Greekπνεῦμα (pneûma)influ.
6. Ancient Greekπνεύμων (pneúmōn)
7. Englishpneumo-
8. Proto-Indo-European*h₂eǵ-
9. Proto-Indo-European*h₂éǵeti
10. Proto-Italic*agō
11. Latinagō
12. Ancient Greekἐνεργητικός (energētikós)
13. Latināctīvu
14. Old Frenchactif
15. Middle Englishactyf
16. Englishactive
17. Englishactivate
18. English todaypneumoactivate

From pneumo- + activate.