Etymology
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effulgent (adj.)

1738, back-formation from effulgence, or else from Latin effulgentem (nominative effulgens), present participle of effulgere "to shine out, gleam forth," from assimilated form of ex "out" (see ex-) + fulgere "to shine" (from PIE *bhleg- "to shine, flash," from root *bhel- (1) "to shine, flash, burn"). Related: Effulgently.

updated on October 14, 2017

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Definitions of effulgent from WordNet

effulgent (adj.)
radiating or as if radiating light;
the effulgent daffodils
Synonyms: beaming / beamy / radiant / refulgent
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.