arsenothiol

The story

1. Proto-Indo-European*ǵʰelh₃-
2. Proto-Indo-European*ǵʰl̥h₃enyom
3. Proto-Indo-Iranian*ȷ́ʰr̥Hanyam
4. Proto-Iranian*jr̥Hanyam
5. Old Median*zaranyam
6. Old Median*kā
7. Old Median*zaraniyakā
8. Middle Persian*zarnīk
9. Classical Syriacܙܪܢܝܟܐ (zarnīḵā)
10. Arabicالزَرْنِيخ (az-zarnīḵ)
11. Medieval Greekἀρσενικόν (arsenikón)
12. Latinarsenicum
13. Middle Frencharsenic
14. Middle Englisharsenik
15. Englisharsenic
16. Englisharseno-
17. Proto-Indo-European*dʰewh₂-der.?
18. Ancient Greekθέειον (théeion)
19. Ancient Greekθεῖον (theîon)
20. Englishthio-
21. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
22. Aramaicכוחלא (kuḥlā)
23. Arabicكُحْل (kuḥl)
24. Andalusian Arabicكُحُول (kuḥūl)
25. Medieval Latinalcoho
26. Middle Englishalcofol
27. Englishalcohol
28. Englishthiol
29. English todayarsenothiol

From arseno- + thiol.