arylhydroxylamine

The story

1. Ancient Greekἄρωμα (árōma)
2. Ancient Greekἀρωματικός (arōmatikós)
3. Late Latinarōmaticus
4. Old Frencharomatique
5. Englisharomatic
6. Proto-Indo-European*swel-der.?
7. Ancient Greekῡ̔́λη (hū́lē)
8. Englisharyl
9. Proto-Indo-European*wed-
10. Proto-Indo-European*wódr̥
11. Proto-Hellenic*údōr
12. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
13. Ancient Greekὑδρο- (hudro-)
14. Frenchhydro-
15. Proto-Indo-European*ǵenh₁-
16. Proto-Indo-European*ǵénh₁os
17. Proto-Hellenic*génos
18. Ancient Greekγένος (génos)
19. Frenchhydrogène
20. Englishhydrogen
21. Proto-Indo-European*h₂eḱ-der.?
22. Ancient Greekὀξύς (oxús)
23. Ancient Greekγένος (génos)
24. Frenchoxygène
25. Englishoxygen
26. Englishhydroxyl
27. Egyptianjmn
28. Ancient GreekᾸ̓́μμων (Ắmmōn)
29. LatinAmmōn
30. Latinammoniacus
31. Englishammonia
32. Englishamine
33. Englishhydroxylamine
34. English todayarylhydroxylamine

From aryl + hydroxylamine.