acylphosphatidylethanolamine

The story

1. Proto-Indo-European*h₂eḱ-
2. Proto-Indo-European*h₂eḱéh₁yeti
3. Proto-Italic*akēō
4. Latinaceō
5. Proto-Indo-European*swel-der.?
6. Ancient Greekῡ̔́λη (hū́lē)
7. Englishacyl
8. Proto-Indo-European*bʰeh₂-
9. Proto-Indo-European*bʰéh₂os
10. Proto-Hellenic*pʰáwos
11. Ancient Greekφᾰ́ος (phắos)
12. Ancient Greekφῶς (phôs)
13. Proto-Indo-European*bʰer-
14. Proto-Indo-European*bʰéreti
15. Proto-Hellenic*pʰérō
16. Ancient Greekφέρω (phérō)
17. Ancient Greekφωσφόρος (phōsphóros)
18. Latinphōsphorus
19. Frenchphosphore
20. Frenchphosphate
21. Englishphosphate
22. Proto-Indo-European*dʰeh₁-
23. Englishphosphatide
24. Englishphosphatidate
25. Englishphosphatidyl
26. Proto-Indo-European*h₂eydʰ-
27. Proto-Hellenic*áitʰō
28. Ancient Greekαἴθω (aíthō)
29. Ancient Greekᾱ̓ήρ (āḗr)influ.?
30. Ancient Greekαἰθήρ (aithḗr)
31. Latinaethēr
32. GermanÄther
33. GermanEther
34. Ancient Greekῡ̔́λη (hū́lē)
35. GermanEthy
36. Englishethyl
37. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
38. Aramaicכוחלא (kuḥlā)
39. Arabicكُحْل (kuḥl)
40. Andalusian Arabicكُحُول (kuḥūl)
41. Medieval Latinalcoho
42. Middle Englishalcofol
43. Englishalcohol
44. Englishethyl
45. Englisheth-
46. Englishethane
47. Englishalcohol
48. Englishethanol
49. Egyptianjmn
50. Ancient GreekᾸ̓́μμων (Ắmmōn)
51. LatinAmmōn
52. Latinammoniacus
53. Englishammonia
54. Englishamine
55. Englishethanolamine
56. Englishphosphatidylethanolamine
57. English todayacylphosphatidylethanolamine

From acyl + phosphatidylethanolamine.