n. [ Dim. fr. L. lux, lucis, light. ] (Astron.) A spot or fleck on the sun brighter than the surrounding surface. [ 1913 Webster ]
a. [ L. luculentus, from lux, lucis, light. ]
Most debonair and luculent lady. B. Jonson. [ 1913 Webster ]
adv. In a luculent manner; clearly. [ 1913 Webster ]