GRC
Bailly
ατος (τὸ) c. ἀπαυγασμός SPT. Sap. 7, 26 ; NT. Hebr. 1, 3 ; HLD. 5, 27, etc.
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LSJ
ατος, τό, radiance, effulgence, of light beaming from a luminous body, φωτὸς ἀϊδίου LXX Wi. 7.26; δόξης Ep. Hebr. 1.3, cf. Ph. 1.337, al., Hld. 5.27, Dam. ap. Simp. in Ph. 775.15.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
τό, Abglanz, Heliod. 5.27 ; NT.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
TBESG
ἀπ-αύγασμα, -τος, τό
(< αὐγή, brightness, whence ἀπαυγάζω, to radiate or reflect) [in LXX: Wis.7:26 * ;]
of light beaming from a luminous body, radiance, effulgence: Heb.1:3.†
(AS)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars