from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Easily understood; intelligible.
  • adj. Mentally sound; sane or rational.
  • adj. Translucent or transparent. See Synonyms at clear.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. clear; easily understood
  • adj. mentally rational; sane
  • adj. bright, luminous, translucent or transparent
  • n. A lucid dream.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Shining; bright; resplendent.
  • adj. Clear; transparent.
  • adj. Presenting a clear view; easily understood; clear.
  • adj. Bright with the radiance of intellect; not darkened or confused by delirium or madness; marked by the regular operations of reason.

from The Century Dictionary and Cyclopedia

  • Emitting light; shining; bright; resplendent: as, the lucid orbs of heaven.
  • Transmitting or reflecting light; clear; transparent; pellucid: as, a lucid stream.
  • Marked by intellectual clearness or brightness; free from obscurity or confusion of thought, or, specifically, from delirium; clear headed; sane: as, a lucid mind; lucid perceptions; lucid intervals in insanity.
  • Presenting a clear view; easily understood; distinct: as, a lucid order or arrangement; a lucid style of writing.
  • In entomology
  • Smooth and very shining; reflecting light like polished metal.
  • Giv ing light; phosphorescent; luciferous.
  • In botany, having a shining surface

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of language) transparently clear; easily understandable
  • adj. having a clear mind
  • adj. transmitting light; able to be seen through with clarity
  • adj. capable of thinking and expressing yourself in a clear and consistent manner


Latin lūcidus, from lūcēre, to shine; see leuk- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin lucidus, from lux ("light") + -id. (Wiktionary)


  • Actually the evo in lucid is the same one that was shipped in Karmic because we wanted it to be stable.

    Thanks Evolution Developers | jonobacon@home

  • See, because this is what we call the lucid dreaming, where you can really change your dreams around.

    CNN Transcript Aug 2, 2002

  • "What occurs sometimes is a person will get up looking and feeling fine and have what we call a lucid period right after the injury, not unlike what was reported in the media for Natasha Richardson," said Dr Felise Zollman, a brain injury expert at the Rehabilitation Institute of Chicago.

    ta tvnz national headlines auto group

  • While the lurid events of some stories have a ripped-from-the-headlines feel, Oates is never merely sensational, tracking hidden motives and emotions with a sharp eye for psychological detaileverything conveyed in lucid, rhythmic prose.

    High Lonesome by Joyce Carol Oates: Book summary

  • The modern mind has built up for itself theories and ideologies whereby it prevents itself from seeing the truth that a man like Benedict XVI spells out for it in lucid and rigorously argued terms – terms fully aware and familiar with all of modern philosophy itself.


  • It's just that we vastly prefer that it be done in lucid, and in a perfect world, elegant prose.

    Archive 2006-07-01

  • Bassett remembered that, at the time, in lucid moments, he had compared himself to a wounded bull pursued by plains coyotes too cowardly to battle with him for the meat of him, yet certain of the inevitable end of him, when they would be gorged.

    The Red One

  • Bassett remembered that at the time, in lucid moments, he had likened himself to a wounded bull pursued by plains 'coyotes too cowardly to battle with him for the meat of him, yet certain of the inevitable end of him when they would be full gorged.

    The Red One

  • I would then look at/etc/apt/sources. list to make sure that the install had gotten as far as changing this from karmic to lucid (look for the word lucid in each line). not_yet

    Ubuntu Forums

  • I saw a commercial where a guy wakes up and say oh i have heard about this its called lucid dreaming so i got on today to check it out.

    Serendip's Exchange -


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  • "bright with light" or "clear and easy to understand."
    from MW word of the day 5/19/2010

    May 25, 2010