stairchair

The story

1. Proto-Indo-European*steygʰ-
2. Proto-Indo-European*stéygʰeti
3. Proto-Germanic*stīganą
4. Proto-Germanic*staigijaną
5. Proto-Germanic*staigraz
6. Proto-Germanic*staigriz
7. Proto-West Germanic*staigri
8. Old Englishstǣġer
9. Middle Englishsteire
10. Englishstair
11. Proto-Indo-European*ḱe?
12. Proto-Indo-European*ḱóm
13. Proto-Indo-European*ḱm̥-th₂der.?
14. Proto-Hellenic*kətá
15. Ancient Greekκατά (katá)
16. Proto-Indo-European*sed-
17. Proto-Indo-European*sedreh₂
18. Proto-Hellenic*hédrā
19. Ancient Greekἕδρα (hédra)
20. Ancient Greekκᾰθέδρᾱ (kăthédrā)
21. Latincathedra
22. Old Frenchchaiere
23. Middle Englishchayere
24. Englishchair
25. English todaystairchair

From stair + chair.