chairwarmer

The story

1. Proto-Indo-European*ḱe?
2. Proto-Indo-European*ḱóm
3. Proto-Indo-European*ḱm̥-th₂der.?
4. Proto-Hellenic*kətá
5. Ancient Greekκατά (katá)
6. Proto-Indo-European*sed-
7. Proto-Indo-European*sedreh₂
8. Proto-Hellenic*hédrā
9. Ancient Greekἕδρα (hédra)
10. Ancient Greekκᾰθέδρᾱ (kăthédrā)
11. Latincathedra
12. Old Frenchchaiere
13. Middle Englishchayere
14. Englishchair
15. Proto-Germanic*warmaz
16. Proto-Germanic*warmijaną
17. Proto-West Germanic*warmijan
18. Old Englishwierman
19. Proto-West Germanic*warmōn
20. Old Englishwearmian
21. Middle Englishwarmen
22. Englishwarm
23. Englishwarmer
24. English todaychairwarmer

From chair + warmer.