Strong's Greek #541
ἀπαύγασμα

Englishman's Concordance (References)

ἀπαύγασμα apaugasma — 1 Occurrence

Hebrews 1:3 - N-NNS
GRK:ὃς ὢν ἀπαύγασμα τῆς δόξης
NAS:And He is the radiance of His glory
KJV: being the brightness of [his] glory,
INT: who being [the] radiance of the glory