πενθημιμερής
From LSJ
ἀρχὴν μὲν μὴ φῦναι ἐπιχθονίοισιν ἄριστον· φύντα δ' ὅμως ὤκιστα πύλας Ἀίδαο περῆσαι → First, it is best for mortals to not be born. If born, to pass through Hades' gates as soon as possible.
English (LSJ)
ές,
A consisting of five halves, i. e. of two and a half : in Prosody, τομὴ π. the caesura after two feet and a half, as in Hexam. and Iamb. Trim., Aristid. Quint.1.25, etc.; τὸ π. (with or without μέτρον) the first two feet and a half of a verse, Quint.Inst.9.4.78, Heph. 7.3, al., Sch.Ar.Av.627.
German (Pape)
[Seite 555] ές, aus fünf halben, d. i. aus 21/2Theilen bestehend; τὸ πενθημιμερές, sc. μέρος, od. ἡ πενθημιμερής, sc. τομή, der Theil eines Verses, der aus den ersten 21/2 Füßen desselben besteht, bes. im Hexameter und im jambischen Trimeter, Gramm.