effulgent (adj.)youdaoicibaDictYouDict[effulgent 词源字典]
1738, back-formation from effulgence, or else from Latin effulgentem (nominative effulgens), present participle of effulgere "to shine out, gleam forth," from ex "out" (see ex-) + fulgere "to shine" (see bleach (v.)). Related: Effulgently.[effulgent etymology, effulgent origin, 英语词源]