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lucid

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lu⋅cid

  [loo-sid]
Use lucid in a Sentence
–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; < L lūcidus, equiv. to lūc-, s. of lūx light 1 + -idus -id 4

Related forms:
lu⋅cid⋅i⋅ty, lu⋅cid⋅ness, noun
lu⋅cid⋅ly, adverb

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

Antonyms:
1, 4. obscure. 2. irrational. 3. dim.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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lu·cid   (lōō'sĭd)   
adj.  

  1. Easily understood; intelligible.

  2. Mentally sound; sane or rational.

  3. Translucent or transparent. See Synonyms at clear.


[Latin lūcidus, from lūcēre, to shine; see leuk- in Indo-European roots.]
lu·cid'i·ty, lu'cid·ness n., lu'cid·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: lu·cid
Pronunciation: 'lü-s&d
Function: adjective
: having, showing, or characterized by an ability to think clearly andrationally —lu·cid·i·ty noun plural -ties
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Computing Dictionary

LUCID
1. Early query language, ca. 1965, System Development Corp, Santa Monica, CA. [Sammet 1969, p.701].
2. A family of dataflow languages descended from ISWIM, lazy but first-order.
Ashcroft & Wadge , 1981.
They use a dynamic demand driven model. Statements are regarded as equations defining a network of processors and communication lines, through which the data flows. Every data object is thought of as an infinite stream of simple values, every function as a filter. Lucid has no data constructors such as arrays or records. Iteration is simulated with 'is current' and 'fby' (concatenation of sequences). Higher-order functions are implemented using pure dataflow and no closures or heaps.
["Lucid: The Dataflow Language" by Bill Wadge and Ed Ashcroft, c. 1985]. ["Lucid, the Dataflow Programming Language", W. Wadge, Academic Press 1985].
(1995-02-16)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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