lambent [ˈlæmbənt] a.
1.) Of a flame (fire, light): Playing lightly upon or gliding over a surface without burning it, like a ‘tongue of fire’; shining with a soft clear light and without fierce heat. Also figurative.
2.) By extension, of eyes, the sky, etc.: Emitting, or suffused with, a soft clear light; softly radiant.
3.) Of wit, style, etc.: Playing lightly and brilliantly over its subjects; gracefully sportive.
4.) In etymological sense: Licking, that licks (Oxford English Dictionary 2nd Edition).
Etymology: Latin lambens, present participle of lambere, to lick.
"Yet more, when fair Lavinia fed the fire
Before the gods, and stood beside her sire,
(Strange to relate!) the flames, involv'd in smoke
Of incense, from the sacred altar broke,
Caught her dishevel'd hair and rich attire;
Her crown and jewels crackled in the fire:
From thence the fuming trail began to spread
And lambent glories danc'd about her head."
(The Aeneid by Virgil, John Dryden (trans.), 1697)