Definition of: radiant

(rā′dē·ənt) adjective
1. Emitting rays of light or heat.
2. Beaming with light or brightness, kindness, or love: a radiant smile.
3. Resembling rays; consisting of or transmitted by radiations: radiant heat. See synonyms under BRIGHT.
—noun
1. A straight line proceeding from and conceived as revolving around a given point.
2. Astron. That point in the heavens from the direction of which, during a meteoric shower, the meteors seem to shoot.
3. The luminous point from which light proceeds or is made to radiate.
4. That which radiates. [<L radians, -antis, ppr. of radiare emit rays <radius ray]
—ra′di·ant·ly adverb