lucid

[loo-sid]
adjective
1.
easily understood; completely intelligible or comprehensible: a lucid explanation.
2.
characterized by clear perception or understanding; rational or sane: a lucid moment in his madness.
3.
shining or bright.
4.
clear; pellucid; transparent.

Origin:
1575–85; < Latin lūcidus, equivalent to lūc-, stem of lūx light1 + -idus -id4

lucidity, lucidness, noun
lucidly, adverb
nonlucid, adjective
nonlucidly, adverb
nonlucidness, noun
unlucid, adjective
unlucidly, adverb
unlucidness, noun


1. plain, understandable, evident, obvious. 2. sound, reasonable. 3. radiant, luminous. 4. limpid.


1, 4. obscure. 2. irrational. 3. dim.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lucid (ˈluːsɪd)
 
adj
1.  readily understood; clear
2.  shining or glowing
3.  psychiatry of or relating to a period of normality between periods of insane or irresponsible behaviour
 
[C16: from Latin lūcidus full of light, from lūx light]
 
lu'cidity
 
n
 
'lucidness
 
n
 
'lucidly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

lucid
1591, "bright, shining," from L. lucidus "light, bright, clear," from lucere "to shine," from lux (gen. lucis) "light," from PIE base *leuk- "to shine, be bright" (see light (n.)). Sense of "easy to understand" first recorded 1786. Lucid interval "period of calm or temporary
sanity" (1581) is from M.L. lucida intervalla (pl.), which was common in medieval Eng. legal documents (cf. non est compos mentis, sed gaudet lucidis intervallis).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Many people have never taken a biology course that dealt with evolution nor
  read a book in which the theory was lucidly explained.
The evidence is lucidly presented, in both words and images.
Although hardly definitive, it is still an excellent book, well researched and
  lucidly written.
Indeed, it is difficult to hypothesize how the insurer could more lucidly have
  defined the acts in question.
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