τρισευδαίμων
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)
ον, gen. ονος,
A thrice-happy, B.3.10, Luc.Sacr.2, Merc.Cond.3, etc.
Greek (Liddell-Scott)
τρισευδαίμων: -ον, τρὶς εὐδαίμων, πάνυ εὐδαίμων, ὡς τὸ τρισόλβιος, τρίσμακαρ, Λουκ. περὶ Θυσιῶν 2, περὶ τῶν ἐπὶ Μισθ. Συνόντ. 3, κλπ.