Strong's Concordance

Original word: ἐξαστράπτω
Transliteration: exastraptó
Definition (short): gleaming
Definition (full): to flash or gleam like lightning, be radiant

NAS Exhaustive Concordance

Word Origin: from ek and astraptó
Definition: to flash or gleam like lightning, be radiant
NASB Translation: gleaming (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From ek and astrapto; to lighten forth, i.e. (figuratively) to be radiant (of very white garments) -- glistening.

see GREEK ek

see GREEK astrapto

KJV: And as he prayed, the fashion of his countenance was altered, and his raiment was white and glistering.
NASB: And while He was praying, the appearance of His face became different, and His clothing became white and gleaming.