Where does “ἀγκυλιστής” come from?

ἀγκυλιστής (Ancient Greek) comes from Ancient Greek ἀγκυλίς, from Ancient Greek ἀγκῠ́λος, from Proto-Indo-European h₂enkulos, from Proto-Indo-European h₂énkos, from Proto-Indo-European -os — Creates action nouns or result nouns from verbs;...