trinitroresorcinol

The story

1. Proto-Indo-European*tréyes
2. Proto-Indo-European*tri-
3. Proto-Italic*tri-
4. Latintri-
5. Englishtri-
6. Englishnitro
7. Englishtrinitro
8. Ancient Greekῥητῑ́νη (rhētī́nē)
9. Latinrēsīna
10. Old Frenchrésine
11. Middle Englishresyn
12. Englishresin
13. Proto-Indo-European*h₂ew-
14. Proto-Indo-European*h₂ṓws
15. Proto-Italic*ausis
16. Latinauris
17. Latinauricula
18. Latinōricula
19. Italianoricello
20. Arabic[script needed] ('urjālla)influ.
21. Old Catalanorxella
22. Old Frenchorchel
23. Frenchorseille
24. Dutchorseille
25. New Latinorcina
26. Frenchorcine
27. Englishorcin
28. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
29. Aramaicכוחלא (kuḥlā)
30. Arabicكُحْل (kuḥl)
31. Andalusian Arabicكُحُول (kuḥūl)
32. Medieval Latinalcoho
33. Middle Englishalcofol
34. Englishalcohol
35. Englishorcinol
36. Englishresorcinol
37. English todaytrinitroresorcinol

From trinitro + resorcinol.