radiating or reflecting light; shining; bright.
lighted up or illuminated; well-lighted: the luminous ballroom.
brilliant intellectually; enlightened or enlightening, as a writer or a writer's works: a luminous concept; luminous prose.
clear; readily intelligible: a concise, luminous report.

1400–50; late Middle English < Latin lūminōsus. See lumen, -ous

luminously, adverb
luminousness, noun
nonluminous, adjective
nonluminously, adverb
nonluminousness, noun
self-luminous, adjective
semiluminous, adjective
semiluminously, adverb
semiluminousness, noun
unluminous, adjective
unluminously, adverb
unluminousness, noun

1. lucid, radiant, resplendent, brilliant. 3. bright, intelligent. 4. understandable, perspicuous, lucid.

1, 2. dark. 3. stupid. 4. obscure. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
luminous (ˈluːmɪnəs)
1.  radiating or reflecting light; shining; glowing: luminous colours
2.  (not in technical use) exhibiting luminescence: luminous paint
3.  full of light; well-lit
4.  Compare radiant (of a physical quantity in photometry) evaluated according to the visual sensation produced in an observer rather than by absolute energy measurements: luminous flux; luminous intensity
5.  easily understood; lucid; clear
6.  enlightening or wise
[C15: from Latin lūminōsus full of light, from lūmen light]

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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Word Origin & History

early 15c., "full of light," from L. luminosus "shining, full of light," from lumen (gen. luminis) "light," related to lucere "to shine" (see light (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

luminous lu·mi·nous (lōō'mə-nəs)
Emitting light, especially emitting self-generated light.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If any of the cells happen to be cancerous, the luminous molecules will stick
  to them.
Scientists refer to these phenomena as transient luminous events.
Tipped with a lure of luminous flesh this built-in rod baits prey close enough
  to be snatched.
But in fact planetary nebulae have nothing to do with planets-they are luminous
  clouds thrown off by dying stars.
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