distomedially

The story

1. Proto-Indo-European*dwóh₁
2. Proto-Indo-European*trísinflu.
3. Proto-Indo-European*d(w)is-
4. Proto-Italic*dis-
5. Latindis-
6. Proto-Indo-European*steh₂-
7. Proto-Indo-European*sth₂éh₁yeti
8. Proto-Italic*staējō
9. Proto-Italic*staēō
10. Latinstō
11. Latindistō
12. Latindistāns
13. Old Frenchdistant
14. Middle Englishdistaunt
15. Englishdistant
16. Proto-Indo-European*h₂el-
17. Proto-Indo-European*h₂élisder.?
18. Englishdistalbf.
19. Englishdisto-
20. Proto-Indo-European*me
21. Proto-Indo-European*dʰeh₁-?
22. Proto-Indo-European*médʰi
23. Proto-Indo-European*médʰyos
24. Proto-Italic*meðios
25. Latinmedius
26. Latinmediālis
27. Englishmedial
28. Englishdistomedial
29. English todaydistomedially

From distomedial + -ly.