radiant

American  

[rey-dee-uhnt] / ˈreɪ di ənt /

adjective

1. emitting rays of light; shining; bright.

   the radiant sun;

   radiant colors.

   Synonyms:

   resplendent, refulgent, beaming

   Antonyms:

   dim

2. bright with joy, hope, etc..

   radiant smiles;

   a radiant future.

3. Physics. emitted or propagated by radiation.

4. Heraldry.

   1. noting a partition line having a series of flamelike indentations formed by ogees joined in zigzags; rayonny.

   2. (of a charge, as an ordinary) having an edge or edges so formed.

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noun

1. a point or object from which rays proceed.

2. Astronomy. the point in the heavens from which a shower of meteors appears to radiate.

3. a refractory absorbing and radiating heat from the flames of a gas fireplace or the like.

radiant British  

/ ˈreɪdɪənt /

adjective

1. sending out rays of light; bright; shining

2. characterized by health, intense joy, happiness, etc

   a radiant countenance

3. emitted or propagated by or as radiation; radiated

   radiant heat

4. sending out heat by radiation

   a radiant heater

5. physics (of a physical quantity in photometry) evaluated by absolute energy measurements Compare luminous

   radiant flux

   radiant efficiency

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noun

1. a point or object that emits radiation, esp the part of a heater that gives out heat

2. astronomy the point in space from which a meteor shower appears to emanate

radiant Scientific  

/ rā′dē-ənt /

1. Transmitting light, heat, or other radiation. Stars, for example, are radiant bodies.

2. Consisting of or transmitted as radiation.

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1. The apparent celestial origin of a meteor shower. For example, a point in the constellation Gemini is the radiant of the Geminid meteor shower.

Related Words

See bright.

Other Word Forms

• antiradiant adjective
• nonradiant adjective
• nonradiantly adverb
• radiantly adverb
• superradiant adjective
• unradiant adjective

Etymology

Origin of radiant

First recorded in 1400–50; late Middle English, from Latin radiant-, stem of radiāns “shining,” present participle of radiāre “to radiate light, shine,” verb derivative of radius “beam, ray”; see radius

Explanation

The adjective radiant is useful for describing anything that glows with warmth or light. When you open your eyes on a sunny summer morning and see your curtains glowing with sunlight, you can call them radiant. Something that shines or glows is radiant, and you can also describe anything that's bright as radiant, like a smile or a powerful emotion ("a radiant sense of happiness"). In science, radiant means "transmitted by radiation," and it usually describes heat, like the radiant heat from an oven. The Latin root is radiantem, "shining," and sometime around 1500 it started being used to describe physical beauty, which Shakespeare did in "Twelfth Night": "Most radiant, exquisite, and unmatchable beauty..."

Example Sentences

Ahead of the ceremony, she warmed Manchester up with a radiant, candlelit charity gig at the city's Albert Hall venue on Thursday.

From BBC • Feb. 28, 2026

And much like his newly purchased pad, Simmons’ former home “utilizes solar-power for pool and radiant heated flooring, eco-materials and fire-resistant, waterproof triple-panel windows.”

From MarketWatch • Feb. 27, 2026

Recent studies into fire mechanics have generally found that the intense heat from wildfire can quickly dry out these plants, making them susceptible to ignition from embers, flames and radiant heat.

From Los Angeles Times • Jan. 13, 2026

The painting’s full-length figures, like those in Old Master official portraits, are here translated into a contemporary vernacular, with a radiant Aline Charigot, Renoir’s future wife, in the arms of his friend Paul Lhote.

From The Wall Street Journal • Dec. 20, 2025

The stars looked so much bigger, so much more radiant than I’d ever seen them before.

From "Flying Through Water" by Mamle Wolo

Related Words

• beaming
• brilliant
• gleaming
• glittering
• glowing
• incandescent
• lustrous
• resplendent
• shining
• sunny