ἐπένθεσις
From LSJ
εἰ ἀποκρυπτόντων τῶν Μήδων τὸν ἥλιον ὑπὸ σκιῇ ἔσοιτο πρὸς αὐτοὺς ἡ μάχη καὶ οὐκ ἐν ἡλίῳ → if the Medes hid the sun, the battle would be to them in the shade and not in the sun
English (LSJ)
εως, ἡ,
A insertion, as of a letter, A.D.Pron.82.4; of a word, Id.Synt.78.24, Phlp. in APo.186.26; application of a drug, Paul.Aeg.6.42.
German (Pape)
[Seite 915] ἡ, das Einschieben, Sp., bes. Schol.
Greek (Liddell-Scott)
ἐπένθεσις: ἡ, (ἐπεντίθιμι), παρενθήκη, οἷον γράμματος, «τὸν ἀργὸν κατ’ ἐπένθεσιν ἀεργὸν λέγουσι» Γρηγ. Κορίνθου σ. 323, κλ.