oxoalkyl

The story

1. Proto-Indo-European*h₂eḱ-der.?
2. Ancient Greekὀξύς (oxús)
3. Proto-Indo-European*ǵenh₁-
4. Proto-Indo-European*ǵénh₁os
5. Proto-Hellenic*génos
6. Ancient Greekγένος (génos)
7. Frenchoxygène
8. Englishoxygen
9. Englishoxo-
10. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
11. Aramaicכוחלא (kuḥlā)
12. Arabicكُحْل (kuḥl)
13. Andalusian Arabicكُحُول (kuḥūl)
14. Medieval Latinalcoho
15. Middle Englishalcofol
16. Englishalc(ohol)
17. Proto-Indo-European*swel-der.?
18. Ancient Greekῡ̔́λη (hū́lē)
19. Englishalkyl
20. English todayoxoalkyl

From oxo- + alkyl.