- effulgence (n.)
- 1660s (Milton), from Late Latin effulgentia (from Latin effulgentum; see effulgent).
- effulgent (adj.)
- 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.