thioalkyne

The story

1. Proto-Indo-European*dʰewh₂-der.?
2. Ancient Greekθέειον (théeion)
3. Ancient Greekθεῖον (theîon)
4. Englishthio-
5. Akkadian𒎎𒋆𒁉𒍣𒁕 (guḫlum)
6. Aramaicכוחלא (kuḥlā)
7. Arabicكُحْل (kuḥl)
8. Andalusian Arabicكُحُول (kuḥūl)
9. Medieval Latinalcoho
10. Middle Englishalcofol
11. Englishalc(ohol)
12. Proto-Indo-European*swel-der.?
13. Ancient Greekῡ̔́λη (hū́lē)
14. Englishalkyl
15. Englishalkyne
16. English todaythioalkyne

From thio- + alkyne.