ἑπτάφθογγος
From LSJ
τὸ ἀγαθὸν αἱρετόν· τὸ δ' αἱρετὸν ἀρεστόν· τὸ δ' ἀρεστὸν ἐπαινετόν· τὸ δ' ἐπαινετὸν καλόν → what is good is chosen, what is chosen is approved, what is approved is admired, what is admired is beautiful
English (LSJ)
ον,
A seven-toned, κιθάρα E.Ion881 (lyr.); συμφωνία Nicom.Exc.6.
German (Pape)
[Seite 1013] siebentönig, κιθάρα Eur. Ion 881; λύρα Clem. Al.