Where does “arche” come from?

arche (Old French) comes from Late Latin arca, from Latin arcus, from Latin solium, from Proto-Indo-European sodyom, from Proto-Indo-European sḗd-.

arche (Old French): arch

Definitions

Step	Language	Word	Meaning
1	Late Latin	arca	chest, box, coffer, safe; coffin; ark
2	Latin	arcus	arc, arch; bow; rainbow
3	Latin	solium	seat, chair; throne, chair of state, official...
4	Proto-Indo-European	sodyom	—
5	Proto-Indo-European	sḗd-	—

arche — Etymology, Origin & Word History | Etymology Explorer