Definition of luminous
- luminous objects—the nebula, the stars, the planets
- —Lincoln La Paz
- luminous with sunlight
I saw the cat's luminous eyes in my car's headlights.
a watch with a luminous dial
The room was luminous with sunlight.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'luminous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Luminous, like its synonyms radiant, shining, glowing, and lustrous, is generally a positive adjective, especially when it describes something that doesn't literally glow, such as a face, a performance, or a poem. Luminous signs depend on a gas such as neon, krypton, argon, xenon, or radon—and you can use luminous (DayGlo) paint to make your own signs. New technologies have now given us luminous fabrics, which are being used to produce striking or creepy effects in clothing, upholstery, and interior surfaces.
First Known Use: 15th centurySee Words from the same year
apparent, bald, bald-faced, barefaced, broad, clear, clear-cut, crystal clear, decided, distinct, evident, lucid, manifest, nonambiguous, obvious, open-and-shut, palpable, patent, pellucid, perspicuous, plain, straightforward, transparent, unambiguous, unambivalent, unequivocal, unmistakable;
: producing or seeming to produce light
: filled with light : brightly lit
: very bright in color
What made you want to look up luminous? Please tell us where you read or heard it (including the quote, if possible).
Confusing Words—A Quiz