Comes from Latin coruscatus , past participle of coruscare , "to move quickly, to tremble, to flutter, to twinkle or flash." The noun form is coruscation . Also from coruscare is the adjective coruscant , "glittering in flashes; flashing."
The single rose that floated to the surface of the harbor, however, had begun to glow with a strange, blue light. It seemed to grow larger as the glow intensified. Then, her face calm, Polgara appeared in the very center of that coruscating incandescence. A few feet to her left there also appeared a nimbus of flickering light. Before the stunned eyes of those on the quay, the nimbus suddenly coalesced, and there, standing beside Polgara, Garion saw the glowing form of the God Aldur.
-King of the Murgos by David Eddings