radiant Definition

radiant
adj

1. Emitting electromagnetic radiation, eg rays of light or heat.
2. Glowing or shining.

Thesaurus: aglow, shining, sparkling, resplendent, sunny, illuminated, gleaming, lustrous; Antonym: dull, drab.
3. Said of a person: beaming with joy, love, hope or health.

Thesaurus: ecstatic, exultant, delighted, overjoyed, elated, blithe, merry, rapturous.
4. Transmitted by or as radiation.

noun

1. A point or object which emits electromagnetic radiation, eg light or heat.
2. astron.
The point in the sky from which meteors appear to radiate outward during a meteor shower.

Derivative: radiance

The state of being radiant.
Thesaurus: brilliance, incandescence, splendour, luminosity, shine, lustre, refulgence; Antonym: dullness.

A measure of the amount of electromagnetic radiation being transmitted from or to a point on a surface.

Derivative: radiantly
adverb

Etymology: 15c: Latin, from radiare to radiate, emit rays.