autopista

The story

1. Proto-Indo-European*h₂ew
2. Proto-Indo-European*tó-
3. Proto-Hellenic*autós
4. Proto-Indo-European*h₂ew
5. Ancient Greekαὖ (aû)
6. Ancient Greekτόν (tón)
7. Ancient Greekαὐτός (autós)
8. Ancient Greekαὐτο- (auto-)
9. Spanishauto-
10. Proto-Indo-European*m(y)ewh₁-
11. Proto-Indo-European*m(y)owh₁éyeti
12. Proto-Italic*moweō
13. Latinmoveō
14. Latinmobili
15. Spanishmóvil
16. Spanishautomóvilclip.
17. Spanishauto
18. Italianpista
19. Spanishpista
20. Spanishautopista
21. English todayautopista

Borrowed from Spanish autopista.