Where does “-hedra” come from?

-hedra (English) comes from Ancient Greek ἕδρα, from Proto-Hellenic *hédrā.

-hedra (English): plural of -hedron

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ἕδρα	seat, chair, stool, bench; the act of sitting;...
2	Proto-Hellenic	*hédrā	—

-hedra — Etymology, Origin & Word History | Etymology Explorer