▪ showing ability to think clearly, especially in the intervals between periods of confusion or insanity: "he has a few lucid moments every now and then"Similarrationalsanein one's right mindin possession of one's facultiesof sound mindable to think clearlynormalbalancedwell balancedsensibleclearheadedright-mindedsobercompos mentisinformal:all therewith all one's marblesOppositemuddled
▪ (of a dream) experienced with the dreamer feeling awake, aware of dreaming, and able to control events consciously.
Word Originlate 16th century (in lucid (sense 2)): from Latin lucidus (perhaps via French lucide or Italian lucido) from lucere ‘shine’, from lux, luc- ‘light’.