4. (Her.) Giving off rays; -- said of a bearing; as, the sun radiant; a
crown radiant.
5. (Bot.) Having a raylike appearance, as the large marginal flowers of
certain umbelliferous plants; -- said also of the cluster which has
such marginal flowers.
Radiant energy (Physics), energy given out or transmitted by radiation,
as in the case of light and radiant heat. -- Radiant heat, heat
proceeding in right lines, or directly from the heated body, after the
manner of light, in distinction from heat conducted or carried by
intervening media. -- Radiant point. (Astron.) See Radiant, n., 3.
Ra"di*ant, n. 1. (Opt.) The luminous point or object from which light
emanates; also, a body radiating light brightly.
2. (Geom.) A straight line proceeding from a given point, or fixed
pole, about which it is conceived to revolve.
3. (Astron.) The point in the heavens at which the apparent paths of
shooting stars meet, when traced backward, or whence they appear to
radiate.
Ra"di*ant*ly (r"d*ant*l), adv. In a radiant manner; with glittering
splendor.