ῥητέον
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
English (LSJ)
A one must say, mention, τι Pl.Lg.730c, Sph.227d; one must pronounce, Id.Cra.410c. II ῥητέος, α, ον, to be spoken or mentioned, D.22.62, Hermog.Stat.7.
Greek (Liddell-Scott)
ῥητέον: λεκτέον, μνημονευτέον, τι Πλάτ. Νόμ. 730Β, Σοφ. 227D· πρέπει τις νὰ προφέρῃ, ὁ αὐτ. ἐν Κρατ. 410C. ΙΙ. ῥητέος, α, ον, λεκτέος, μνημονευτέος, Ἑρμογ.
Greek Monotonic
ῥητέον: ρημ. επίθ., αξιομνημόνευτο, αυτό που πρέπει να λεχθεί, αξιοσημείωτο, σε Πλάτ.