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Definition of radiant:

  1. A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.
  2. Beaming with vivacity and happiness; as, a radiant face.
  3. Emitted or transmitted by radiation; as, a radiant energy; radiant heat.
  4. Emitting or proceeding as from a center; resembling rays; radiating; radiate.
  5. 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.
  6. Giving off rays; - said of a bearing; as, the sun radiant; a crown radiant.
  7. Having a raylike appearance, as the large marginal flowers of certain umbelliferous plants; - said also of the cluster which has such marginal flowers.
  8. The luminous point or object from which light emanates; also, a body radiating light brightly.
  9. The point in the heavens at which the apparent paths of shooting stars meet, when traced backward, or whence they appear to radiate.

Synonyms:

absent, atomic, beatific, sunny, black, cosmic radiation, lambent, cosmic rays, happy, becquerel, curious, glittery, shiny, beamy, glad, bright, carbon dating, dark, irradiant, light, lucent, Geiger counter, fulgent, brooding, appealing, refulgent, alpha particle, candescent, aglow, bedazzling, bug-eyed, clear, study at bright, gamma rays, half-life, darkly, effulgent, bleak, sheeny, fission, beaming.

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