alkylphosphine

The story

1. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
2. Aramaicכוחלא (kuḥlā)
3. Arabicكُحْل (kuḥl)
4. Andalusian Arabicكُحُول (kuḥūl)
5. Medieval Latinalcoho
6. Middle Englishalcofol
7. Englishalc(ohol)
8. Proto-Indo-European*swel-der.?
9. Ancient Greekῡ̔́λη (hū́lē)
10. Englishalkyl
11. Proto-Indo-European*bʰeh₂-
12. Proto-Indo-European*bʰéh₂os
13. Proto-Hellenic*pʰáwos
14. Ancient Greekφᾰ́ος (phắos)
15. Ancient Greekφῶς (phôs)
16. Proto-Indo-European*bʰer-
17. Proto-Indo-European*bʰéreti
18. Proto-Hellenic*pʰérō
19. Ancient Greekφέρω (phérō)
20. Ancient Greekφωσφόρος (phōsphóros)
21. Latinphōsphorus
22. Englishphosphorusclip.
23. Englishphosph-
24. Englishphosphine
25. English todayalkylphosphine

From alkyl + phosphine.