methamphetamine

The story

1. Proto-Indo-European*médʰu
2. Proto-Hellenic*métʰu
3. Ancient Greekμέθυ (méthu)
4. Proto-Indo-European*swel-der.?
5. Ancient Greekῡ̔́λη (hū́lē)
6. GermanMethy
7. Englishmethyl
8. Englishmetho-
9. Englishmeth-
10. Proto-Semitic*ʔalp-
11. Phoenician𐤀𐤋𐤐 (ʾlp)
12. Ancient Greekἄλφα (álpha)
13. Proto-Semitic*bayt-
14. Phoenician𐤁𐤕 (bt)
15. Ancient Greekβῆτᾰ (bêtă)
16. Ancient Greekἀλφάβητος (alphábētos)
17. Medieval Greekἀλφάβητον (alphábēton)
18. Classical Latinalphabētum
19. Middle Englishalphabete
20. Englishalphabet
21. Englishalpha-
22. Englishmethyl
23. Proto-Indo-European*bʰeh₂-
24. Proto-Indo-European*bʰh₂nyéti
25. Proto-Hellenic*pʰáňňō
26. Ancient Greekφαίνω (phaínō)
27. Frenchphéno-
28. Ancient Greekῡ̔́λη (hū́lē)
29. Frenchphényle
30. Englishphenyl
31. Englishpheno-
32. Englishphen-
33. Proto-Indo-European*h₂eydʰ-
34. Proto-Hellenic*áitʰō
35. Ancient Greekαἴθω (aíthō)
36. Ancient Greekᾱ̓ήρ (āḗr)influ.?
37. Ancient Greekαἰθήρ (aithḗr)
38. Latinaethēr
39. GermanÄther
40. GermanEther
41. GermanEthy
42. Englishethyl
43. Egyptianjmn
44. Ancient GreekᾸ̓́μμων (Ắmmōn)
45. LatinAmmōn
46. Latinammoniacus
47. Englishammonia
48. Englishamine
49. Englishethylamine
50. Englishphenethylamine
51. Englishmethylphenethylamine
52. Englishalpha-methylphenethylamine
53. Englishamphetamine
54. English todaymethamphetamine

From meth- + amphetamine; 1945–1950.