κελευστικός
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)
ή, όν,
A hortatory: κελευστική (sc. τέχνη), Pl.Plt.260e;
A τοῦ ψόγου τὸ κ. Plu.2.72d (s.v.l.).