Definitions from Wiktionary (radiant)

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

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