adj.1 expressing or expressed clearly; easy to understand.
2 of or denoting intervals of sanity between periods of insanity or dementia.
3 Bot. with a smooth shining surface.
4 poet. bright.
Derivatives:
lucidity n. lucidly adv. lucidness n.
Etymology: L lucidus (perh. through F lucide or It. lucido) f. lucere shine (as LUX)