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1.
adj. Glowing brightly, light, shining.
She looked effulgent descending the staircase in white lace.

On of the adjectives favored by Spike in his poetry (see Buffy the Vampire Slayer).
by Pauline Reage March 03, 2009
 
2.
1. Shiny; resplendent.
2. Spike's favorite word.
'Inspired by your beauty effulgent.'
by Allison March 06, 2005