radiantadj/ˈɹeɪ.di.ənt/

• 1

  Radiating light and/or heat.

  • the radiant sun
  • They in ranks / Sat all, where ſtood the fiery ſteeds of each, / And where his radiant arms lay on the field.
• 2

  Emitted as radiation.

• 3

  Beaming with vivacity and happiness.

  • a radiant face
  • His sister, Mrs. Gerard, stood there in carriage gown and sables, radiant with surprise. ¶ “Phil ! You ! Exactly like you, Philip, to come strolling in from the antipodes—dear fellow !” recovering from the fraternal embrace and holding both lapels of his coat in her gloved hands.
• 4

  Strikingly beautiful.

  • And yet she was ensnaringly beautiful, despite her pride and self-consciousness; radiant and certain of conquest she stood before the man who alone seemed to have neither eye nor ear for charms that had never elsewhere played her false.
• 5

  Emitting or proceeding as if from a center.

• 6

  governmentheraldryhobbiesGiving off rays.

  • the sun radiant
  • a crown radiant
• 7

  biologybotanynatural-sciencesHaving a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers.

radiantnoun/ˈɹeɪ.di.ənt/

• 1

  A point source from which radiation is emitted.

• 2

  astronomynatural-sciencesThe apparent origin, in the night sky, of a meteor shower.

• 3

  geometrymathematicssciencesA straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.