Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
αγκωνίσκουσ joints LXX.Exod.26.17
αγκωνίσκοι joints LXX.Exod.36.22

Liddell-Scott-Jones

ἀγκωνίσκος (agkōniskos) a joint G:N-M

ἀγκωνίσκος-ιον, τό,

elbow, [Refs 2nd c.AD+]

ἀγκων-ίσκος, ,

= {ἀγκωνίσκιον}, [LXX+2nd c.BC+].

LSJ Scripture Refs: LXX.Exod.26.17