ἔξαψις σφοδρὰ μετὰ πολλῆς βίας πίπτουσα ἐπὶ γῆς → a violent flare-up falling on the ground with great force, thunder and lightning
-ου, ὁ Arnaces eunuco de Jerjes, Plu.Arist.9, Them.16.
Hypc. form based upon APers. *arana (cf. hamarana, battle, YAv. hamarəna, Skt. samarana), fr. ar, to set in motion + suffix (a)ka.