τεράεσσι

From LSJ

Βίων δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνονBion used to say that we have two teachers for death: the time before we were born and sleep | Bion said that there are two rehearsals for death: the time before being born and sleep

Source

French (Bailly abrégé)

dat. pl. épq. de τέρας.

Russian (Dvoretsky)

τεράεσσι: эп. dat. pl. к τέρας.