luminous
Americanadjective
-
radiating or reflecting light; shining; bright.
- Synonyms:
- brilliant, resplendent, radiant, lucid
- Antonyms:
- dark
-
lighted up or illuminated; well-lighted.
the luminous ballroom.
- Antonyms:
- dark
-
brilliant intellectually; enlightened or enlightening, as a writer or a writer's works.
a luminous concept; luminous prose.
- Synonyms:
- intelligent, bright
- Antonyms:
- stupid
-
clear; readily intelligible.
a concise, luminous report.
- Synonyms:
- lucid, perspicuous, understandable
- Antonyms:
- obscure
adjective
-
radiating or reflecting light; shining; glowing
luminous colours
-
(not in technical use) exhibiting luminescence
luminous 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 measurements Compare radiant
luminous flux
luminous intensity
-
easily understood; lucid; clear
-
enlightening or wise
Other Word Forms
- 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
Etymology
Origin of luminous
First recorded in 1400–50; late Middle English word from Latin word lūminōsus. See lumen, -ous
Explanation
Luminous means full of or giving off light. During the winter holidays, with all their emphasis on light, you can see luminous displays of candles everywhere. This word has several figurative meanings that are related to the basic sense of something shining. For example, luminous prose is clear and easily understood. And a luminous career is bright and inspiring. The Middle English adjective is from Latin luminosus, from lumen "light."
Vocabulary lists containing luminous
100 Words Every Middle Schooler Should Know
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Let There Be Light: Lum and Luc
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Essential Academic Vocabulary for Middle School Students, List 2
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In wet winters, the valleys beyond town awaken in color as sand verbena, desert sunflower, evening primrose and pincushion gather in brief, luminous blooms across the desert floor.
From Los Angeles Times • Apr. 7, 2026
The eyes, large and luminous, always stand out.
From The Wall Street Journal • Feb. 20, 2026
A luminous outline of Nicolás Maduro and his wife Cilia Flores loomed over Caracas against the night sky in January.
From BBC • Feb. 17, 2026
When black holes are actively feeding and extremely luminous, they are known as quasars.
From Science Daily • Jan. 24, 2026
The substance inside was made from the dried and crushed bodies of luminous deep-sea fishes.
From "Six of Crows" by Leigh Bardugo
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
