Διο-
From LSJ
Ubi idem et maximus et honestissimus amor est, aliquando praestat morte jungi, quam vita distrahi → Where indeed the greatest and most honourable love exists, it is much better to be joined by death, than separated by life.
English (LSJ)
(in Ep. Δῑο- metri gr.), in compds., both sprung from Zeus or the gods, and godlike.
Greek (Liddell-Scott)
Διο-: εὕρηται ἐν ἀρχῇ πολλῶν συνθέτων ὀνομάτων κυρίων τε καὶ προσηγορικῶν, ἅτινα σημαίνουσιν οὐχὶ μόνον τὸ γεγενῆσθαι ἐκ τοῦ Διός ἢ τῶν θεῶν, ἀλλὰ καθόλου, ἔξοχος, θεοειδής, λαμπρός, ὡς ἐν συνθέσεσι τὸ θεο-.