Dictionary entry

ἐξαστράπτω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ἐξ-αστράπτω

[in LXX: Nu 3:3 (בָּרָק), Ez 1:4 (לָקַח hithp.) 1:7 Da LXX 106 (קָלַל)*;]

to flash like lightning, gleam, be radiant: ἱματισμός, Lk 9:29.†