Where does “-τήριον” come from?

-τήριον (Ancient Greek) comes from Ancient Greek -τήρ, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

Ancestry of “-τήριον”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	-τήρ	Added to verb stems to form masculine agent nouns
2	Proto-Indo-European	-tḗr	Derives agent nouns from verbs, denoting someone...

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