Where does “σφιγκτήρας” come from?

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

σφιγκτήρας (Greek): sphincter; clamp

Definitions

sphincter; clamp

Ancestry of “σφιγκτήρας”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	σφιγκτήρ	that which binds tight, lace, band; muscle which...
2	Ancient Greek	-τήρ	Added to verb stems to form masculine agent nouns
3	Proto-Indo-European	-tḗr	Derives agent nouns from verbs, denoting someone...

Every word from Proto-Indo-European -tḗr →Every word from Ancient Greek -τήρ →Every word from Ancient Greek σφιγκτήρ →