The Collaborative International Dictionary of English v.0.48:

Lambent \Lam"bent\, a. [L. lambens, -enlis, p. pr. of lambere to
   lick; akin to lap. See Lap to drink by licking.]
   1. Playing on the surface; touching lightly; gliding over. "A
      lambent flame." --Dryden. "A lambent style."
      --Beaconsfield.
      [1913 Webster]

   2. Twinkling or gleaming; fickering. "The lambent purity of
      the stars." --W. Irving.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lambent
    adj 1: softly bright or radiant; "a house aglow with lights";
           "glowing embers"; "lambent tongues of flame"; "the lucent
           moon"; "a sky luminous with stars" [syn: aglow(p),
           lambent, lucent, luminous]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "lambent":
   aflicker, barely touching, beaming, bickering, blinking, brilliant,
   dancing, effulgent, flashing, flickering, flickery, flicky,
   fluttering, fluttery, incandescent, lucent, luminous, lustrous,
   playing, playing lightly over, quivering, quivery, radiant,
   refulgent, stroboscopic, wavering, wavery