Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
επαοιδών of your enchantments LXX.Isa.47.9
επαοιδαίσ your enchantments LXX.Isa.47.12
επαοιδήν an enchantment LXX.Deut.18.11

Liddell-Scott-Jones

ἐπαοιδή (epaoidē) enchantment G:N-M

ἐπαοιδή,

Ionic dialect and poetry ἐπᾰοιδή, , song sung to or over: hence, enchantment, spell, ἐπαοιδῇ δ᾽ αἷμα..ἔσχεθον [Refs 8th c.BC+]; of the Magi, [Refs 5th c.BC+]; θυσίαι καὶ .[Refs]: with genitive object, charm for or against.., τούτων ἐπῳδὰς οὐκ ἐποίησεν πατήρ [Refs 4th c.BC+]

__II apparently, ={ἐπῳδός} [Refs]