[ loo-muh-nuhs ]
/ ˈlu mə nəs /


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.

Nearby words

  1. luminiferous,
  2. luminism,
  3. luminophore,
  4. luminosity,
  5. luminosity class,
  6. luminous efficacy,
  7. luminous efficiency,
  8. luminous emittance,
  9. luminous energy,
  10. luminous exitance

Origin of luminous

First recorded in 1400–50; late Middle English word from Latin word lūminōsus. See lumen, -ous

Related forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for luminous

British Dictionary definitions for luminous


/ (ˈluːmɪnəs) /


radiating or reflecting light; shining; glowingluminous colours
(not in technical use) exhibiting luminescenceluminous paint
full of light; well-lit
(of a physical quantity in photometry) evaluated according to the visual sensation produced in an observer rather than by absolute energy measurementsluminous flux; luminous intensity Compare radiant
easily understood; lucid; clear
enlightening or wise
Derived Formsluminously, adverbluminousness, noun

Word Origin for luminous

C15: from Latin lūminōsus full of light, from lūmen 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

Medicine definitions for luminous


[ lōōmə-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.