lucid

Etymology

Latin lucidus, from lux (“light”) + -idus.

adj

  1. clear; easily understood
    [T]he book, constructed in short, lucid episodes, can be satisfyingly read as a sequence of provocative talks, at once well informed and vatic. 26 September 2014, Tom Payne, “Sapiens: a Brief History of Humankind by Yuval Noah Harari, review: 'urgent questions' [print version: The story of our species, 27 September 2014, p. R32]”, in The Daily Telegraph (Review)
  2. mentally rational; sane
  3. bright, luminous, translucent or transparent

noun

  1. A lucid dream.
    The day before nightmare-initiated lucids, subjects reported more depressed feelings[…] 1986, Benjamin B. Wolman, Montague Ullman, Handbook of states of consciousness, page 163

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