Ra"di*ant (?), a. (Physics)
Emitted or transmitted by radiation; as, a radiant energy;
radiant heat.
Ra"di*ant (-ant), a. [L.
radians, -antis, p. pr. of radiare to emit rays
or beams, fr. radius ray: cf. F. radiant. See
Radius, Ray a divergent line.] 1.
Emitting or proceeding as from a center; resembling rays;
radiating; radiate.
2. 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.
Mark what radiant state she
spreads.
Milton.
3. Beaming with vivacity and happiness; as, a
radiant face.
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 (?), a. (Physics)
Emitted or transmitted by radiation; as, a radiant energy;
radiant heat.
