Quick Definition
ἐξαστράπτω v. I flash forth like lightning
Strong's Definition
from 1537 and 797; to lighten forth, i.e. (figuratively) to be radiant (of very white garments)
KJV Usage: glistening
UBS Dictionary of the Greek New Testament
verb | ἀστράπτω
14.47 · Physical Events and States · Light
to glisten, to dazzle, to gleam, to flash to give off or to reflect a very bright light
1 It may be that ἐξαστράπτω differs from ἀστράπτω either in emphasizing the source or in suggesting greater intensity of brightness, but NT usage does not provide a clear indication for such a distinction.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Mounce Concise Greek Dictionary
ἐξαστράπτω exastraptō 1x
pr. to flash forth; hence, to glisten as lightning, Lk. 9:29*
Abbott-Smith Greek Lexicon
† 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.†
Moulton & Milligan — Vocabulary of the Greek NT
ἐξαστράπτω. See 5.7. ἀστράπτω. The compound, which occurs in the NT only in Lk 9% (cf. LXX Ezek 147, Nah 33) may convey the idea of ‘‘ flashing forth’ as from an zeward source (cf. Farrar CGT ad 1), but is perhaps simply intensive, ‘‘ dazzling” (RV).
Liddell-Scott-Jones — Greek-English Lexicon
ἐξαστράπτω (exastraptō) — to flash forth. ἐξαστράπτω, flash as with lightning, [LXX+NT]; of the sun's light, Zos.Alch.[Refs 5th c.BC+]