/ ˈluːsɪd; NAmE / adjective
1.
clearly expressed; easy to understand
SYN clear :
a lucid style / explanation
2.
able to think clearly, especially during or after a period of illness or confusion :
In a rare lucid moment, she looked at me and smiled.
► lu·cid·ity / luːˈsɪdəti; NAmE / noun [ U ]
► lu·cid·ly adverb
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WORD ORIGIN
late 16th cent. (originally meaning bright or luminous): from Latin lucidus (perhaps via French lucide or Italian lucido ) from lucere shine, from lux , luc- light.