G0797–ἀστράπτω–astraptō

for as the lightning that is lightening out of the one `part' under heaven, to the other part under heaven doth shine, so shall be also the Son of Man in his day;

ἀστράπτουσα astraptousa “is flashing”

And it came to pass, while they are perplexed about this, that lo, two men stood by them in glittering apparel,

ἀστραπτούσῃ. astraptousē “dazzling.”