Lucid

Webster's Dictionary of the English Language

·noun Clear; transparent.

II. Lucid ·noun Presenting a clear view; easily understood; clear.

III. Lucid ·noun Shining; bright; resplendent; as, the lucid orbs of heaven.

IV. Lucid ·noun Bright with the radiance of intellect; not darkened or confused by delirium or madness; marked by the regular operations of reason; as, a lucid interval.