dialkylthiourea

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. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
8. Aramaicכוחלא (kuḥlā)
9. Arabicكُحْل (kuḥl)
10. Andalusian Arabicكُحُول (kuḥūl)
11. Medieval Latinalcoho
12. Middle Englishalcofol
13. Englishalc(ohol)
14. Proto-Indo-European*swel-der.?
15. Ancient Greekῡ̔́λη (hū́lē)
16. Englishalkyl
17. Englishdialkyl
18. Proto-Indo-European*dʰewh₂-der.?
19. Ancient Greekθέειον (théeion)
20. Ancient Greekθεῖον (theîon)
21. Englishthio-
22. Proto-Indo-European*h₁wers-
23. Ancient Greekοὐρέω (ouréō)
24. Ancient Greekοὖρον (oûron)
25. Frenchurée
26. Englishurea
27. Englishthiourea
28. English todaydialkylthiourea

From dialkyl + thiourea.