dienal

The story

1. Proto-Indo-European*dwóh₁
2. Proto-Indo-European*dwi-
3. Proto-Hellenic*dwi-
4. Ancient Greekδῐ- (dĭ-)
5. Latindi-
6. Englishdi-
7. Englishdiene
8. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
9. Aramaicכוחלא (kuḥlā)
10. Arabicكُحْل (kuḥl)
11. Andalusian Arabicكُحُول (kuḥūl)
12. Latinalcohol
13. Proto-Indo-European*de
14. Proto-Indo-European*déh₁
15. Proto-Italic*dē
16. Latindē
17. Latinde-
18. Proto-Indo-European*wed-
19. Proto-Indo-European*wódr̥
20. Proto-Hellenic*údōr
21. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
22. Ancient Greekῠ̔δρο- (hŭdro-)
23. GermanAldehyd
24. Englishaldehydeclip.
25. English todaydienal

From diene + -al (“aldehyde”).