phosphoenol

The story

1. Proto-Indo-European*bʰeh₂-
2. Proto-Indo-European*bʰéh₂os
3. Proto-Hellenic*pʰáwos
4. Ancient Greekφᾰ́ος (phắos)
5. Ancient Greekφῶς (phôs)
6. Proto-Indo-European*bʰer-
7. Proto-Indo-European*bʰéreti
8. Proto-Hellenic*pʰérō
9. Ancient Greekφέρω (phérō)
10. Ancient Greekφωσφόρος (phōsphóros)
11. Latinphōsphorus
12. Englishphosphorus
13. Englishphospho-
14. Englishalkene
15. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
16. Aramaicכוחלא (kuḥlā)
17. Arabicكُحْل (kuḥl)
18. Andalusian Arabicكُحُول (kuḥūl)
19. Medieval Latinalcoho
20. Middle Englishalcofol
21. Englishalcohol
22. Englishalkenolclip.
23. Englishenol
24. English todayphosphoenol

From phospho- + enol.