ἀστράπτω; (later form στράπτω, see ἀσπάζομαι at the beginning (probably allied with ἀστήρ which see)); to lighten (Homer, Iliad 9, 237; 17, 595, and often in Attic): Luke 17:24. of dazzling objects: ἐσθής (R G ἐσθησεις), Luke 24:4 (and very often in Greek writings from Sophocles Oed. Col. 1067; Euripides, Phoen. 111, down). (Compare: ἐξαστράπτω, περιαστράπτω.)
Luke 17:24 - V-PPA-NFS GRK:ἡ ἀστραπὴ ἀστράπτουσα ἐκ τῆς NAS: the lightning, when it flashes out of one part of the sky, KJV: the lightning, that lighteneth out of INT: the lightning flashes from the [one end]
Luke 24:4 - V-ASA-3S GRK:ἐν ἐσθῆτι ἀστραπτούσῃ NAS: suddenly stood near them in dazzling clothing; KJV: them in shining garments: INT: in garments dazzling