radiant

(noun): A point source from which radiation is emitted.
(noun): The apparent origin, in the night sky, of a meteor shower.
(noun): A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.
(adjective): Radiating light and/or heat.
(adjective): Emitted as radiation.
(adjective): Beaming with vivacity and happiness.
(adjective): Emitting or proceeding as if from a center.
(adjective): Giving off rays; said of a bearing.
(adjective): Having a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers.