lambent

Fire is frequently associated with lapping or licking imagery: flames are often described as "tongues" that "lick." Lambent, which first appeared in English in the 17th century, is a part of this tradition, coming from lambens, the present participle of the Latin verb lambere, meaning "to lick." In its earliest uses, lambent meant "playing lightly over a surface," "gliding over," or "flickering." These uses were usually applied to flames or light, and by way of that association, the term eventually came to describe things with a radiant or brilliant glow, as Alexander Pope used it in his 1717 poem "Eloisa to Abelard": "Those smiling eyes, attemp'ring ev'ry ray, Shone sweetly lambent with celestial day."