ditungsten

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. Proto-Indo-European*ten-
8. Proto-Indo-European*téngʰ-u-s ~ *tn̥gʰ-éw-s
9. Proto-Germanic*þunguz
10. Old Norseþungr
11. Swedishtung
12. Proto-Indo-European*steh₂-
13. Proto-Indo-European*steyh₂-
14. Proto-Indo-European*stóyh₂nos
15. Proto-Germanic*stainaz
16. Proto-Norseᛊᛏᚨᛁᚾᚨᛉ (stainaʀ)
17. Old Norsesteinn
18. Old Swedishsten
19. Swedishsten
20. Swedishtungsten
21. Englishtungsten
22. English todayditungsten

From di- + tungsten.