Liddell-Scott-Jones

διφθέρα (diphthera) a leather covering ^G:N-F

διφθέρα, ἡ,

prepared hide, piece of leather, [Refs 5th c.BC+]; διφθέραι, opposed to δέρρεις (hides), [Refs 5th c.BC+]; of a drum, [διφθέρας καλέουσι ἀπὸ τοῦ παλαιοῦ οἱ Ἴωνες 5th c.BC: Herodotus Historicus 5.58; δ. μελαγγραφεῖς 5th c.BC: Euripides Tragicus “Fragmenta” 627 ">Refs 5th c.BC+]; δ. βασιλικαί, of Persian records, [Refs 5th c.BC+]; δ. ἱεραί, at Carthage, [Refs 1st c.AD+]; χαλκαῖ δ., [διφθέρας λέγεις 4th-5th c.AD: Diogenianus Paroemiographus 3.2 ">Refs 8th c.BC+]; used for bindings, διφθέρας περιβάλλειν (i.e. βιβλίοις) [Refs 2nd c.AD+]

__II anything made of leather, leathern jerkin, [Refs 5th c.BC+]; properly, of goatskin, opposed to μηλωτή, [Refs 1st c.AD+]
__II.2 wallet, bag, [Refs 5th c.BC+]
__II.3 plural, skins used as tents, [Refs 5th c.BC+]