ὀρθοέπεια
From LSJ
διφθέραι σταδιαῖαι τοῖς μεγέθεσιν → hides a stade in size, hides fastened together so as to cover a place an entire stadium in extent
English (LSJ)
ἡ,
A correctness of diction, Democr.20a, Pl.Phdr.267c, Phld.Rh.1.191 S., D.H.Dem.26, Quint.1.6.20.
German (Pape)
[Seite 374] ἡ, die grade, richtige Aussprache (recta locutio, Quint. 1, 6); Plat. Phaedr. 267 c; D. Hal. de vi Dem. 26. Diese grammatische Lehre behandelte Protagoras, Spengel artium scriptores p. 40 ff.
Greek (Liddell-Scott)
ὀρθοέπεια: ἡ, ὀρθότης ὕφους, λεκτικοῦ, Πλάτ. Φαῖδρ. 267C, πρβλ. Κοϊντιλ. 1. 6.