adjective

1. sending out rays of light; shining brightly
2. filled with light; bright a radiant morning
3. showing pleasure, love, well-being, vitality, etc.; beaming a radiant smile
4. issuing (from a source) in or as in rays; radiated radiant energy

Etymology: L radians, prp. of radiare: see radiate

noun

1. the point or object from which heat or light emanates
2. Astron. the point on the celestial sphere from which a shower of meteors appears to come