easily understood; completely intelligible or comprehensible: a lucid explanation.
characterized by clear perception or understanding; rational or sane: a lucid moment in his madness.
shining or bright.
clear; pellucid; transparent.

Origin of lucid

1575–85; < Latin lūcidus, equivalent to lūc-, stem of lūx light1 + -idus -id4
Related formslu·cid·i·ty, lu·cid·ness, nounlu·cid·ly, adverbnon·lu·cid, adjectivenon·lu·cid·ly, adverbnon·lu·cid·ness, nounun·lu·cid, adjectiveun·lu·cid·ly, adverbun·lu·cid·ness, noun

Synonyms for lucid

Antonyms for lucid

1, 4. obscure. 2. irrational. 3. dim. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for lucid

Contemporary Examples of lucid

Historical Examples of lucid

  • Many of his decisions were models of deep research and lucid statement.

  • Thereupon he gave a brief, lucid account of what had occurred in the night.

    Heather and Snow

    George MacDonald

  • Sometimes in lucid moments he thought he was like a place where there had once been a spring.

    Father Sergius

    Leo Tolstoy

  • Milly followed this—it was lucid; but it suggested something apart.

  • He must be master of a lucid, virile, attractive literary style.

    College Teaching

    Paul Klapper

British Dictionary definitions for lucid



readily understood; clear
shining or glowing
psychiatry of or relating to a period of normality between periods of insane or irresponsible behaviour
Derived Formslucidity or lucidness, nounlucidly, adverb

Word Origin for lucid

C16: from Latin lūcidus full of light, from lūx light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for lucid

1590s, "bright, shining," from Latin lucidus "light, bright, clear," figuratively "perspicuous, lucid, clear," from lucere "to shine," from lux (genitive lucis) "light," from PIE root *leuk- "to shine, be bright" (see light (n.)). Sense of "easy to understand" first recorded 1786. Lucid interval "period of calm or temporary sanity" (1580s) is from Medieval Latin lucida intervalla (plural), which was common in medieval English legal documents (cf. non est compos mentis, sed gaudet lucidis intervallis). Related: Lucidly; lucidness (1640s).

Online Etymology Dictionary, © 2010 Douglas Harper