ethyleneimine

The story

1. Proto-Indo-European*h₂eydʰ-
2. Proto-Hellenic*áitʰō
3. Ancient Greekαἴθω (aíthō)
4. Ancient Greekᾱ̓ήρ (āḗr)influ.?
5. Ancient Greekαἰθήρ (aithḗr)
6. Latinaethēr
7. GermanÄther
8. GermanEther
9. Proto-Indo-European*swel-der.?
10. Ancient Greekῡ̔́λη (hū́lē)
11. GermanEthy
12. Englishethyl
13. Englisheth-
14. Ancient Greekῡ̔́λη (hū́lē)
15. Englishethylene
16. Egyptianjmn
17. Ancient GreekᾸ̓́μμων (Ắmmōn)
18. LatinAmmōn
19. Latinammoniacus
20. Englishammonia
21. Englishamine
22. Englishimine
23. English todayethyleneimine

From ethylene + imine.