διαπτυχή
From LSJ
ἄλογον δὴ τὸ μήτε μάχης ἄρξασθαι μήτε τοὺς φίλους φυλάξαι, ἐὰν ὑπό γε τῶν βαρβάρων ἀδικῆσθε → It is irrational neither to begin battle nor to guard the friends, if you are ever wronged by the foreigners
English (LSJ)
ἡ,
A fold, folding leaf, δέλτου διαπτυχαί, γραμμάτων δ., E.IT727,793.
German (Pape)
[Seite 599] ὴ, Falte, δέλτου, γραμμάτων, Eur. I. A. 727. 793, von zusammengefalteten Briefen.