adj beaming with vivacity and happiness; as, a radiant face.
2. radiant ·adj giving off rays;
said of a bearing; as, the sun radiant; a crown radiant.
3. radiant ·adj emitting or proceeding as from a center; resembling rays; radiating; radiate.
4. radiant ·add. ·adj emitted or transmitted by radiation; as, a radiant energy; radiant heat.
5. radiant ·noun the luminous point or object from which light emanates; also, a body radiating light brightly.
6. radiant ·noun a straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.
7. radiant ·noun the point in the heavens at which the apparent paths of shooting stars meet, when traced backward, or whence they appear to radiate.
8. radiant ·adj having a raylike appearance, as the large marginal flowers of certain umbelliferous plants;
said also of the cluster which has such marginal flowers.
9. radiant ·adj especially, emitting or darting rays of light or heat; issuing in beams or rays; beaming with brightness; emitting a vivid light or splendor; as, the radiant sun.