εἰκοστάγωνος
From LSJ
Κύριε, σῶσον τὸν δοῦλον σου κτλ. → Lord, save your slave ... (mosaic inscription from 4th cent. church in the Negev)
German (Pape)
[Seite 727] s. εἰκοσάγωνος.
Greek (Liddell-Scott)
εἰκοστάγωνος: -ον, ἔπρεπε νὰ εἶναι εἰκοσάγωνος, εἴκοσι γωνίας ἔχων, Ἰάμβλ. ἐν Βίῳ Πυθ. 34.