Definition of radiant

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