(||Ra`di*a"le) n.; pl. Radialia (- li*a) [NL. See Radial.]
1. (Anat.) The bone or cartilage of the carpus which articulates with the radius and corresponds to the
scaphoid bone in man.
2. pl. (Zoöl.) Radial plates in the calyx of a crinoid.
(Ra"di*al*ly) adv. In a radial manner.
(Ra"di*an) n. [From Radius.] (Math.) An arc of a circle which is equal to the radius, or the
angle measured by such an arc.
(Ra"di*ance Ra"di*an*cy) (- an*sy), n. The quality of being radiant; brilliancy; effulgence; vivid
brightness; as, the radiance of the sun.
Girt with omnipotence, with radiance crowned.Milton.
What radiancy of glory,Neale.
What light beyond compare !
Syn. Luster; brilliancy; splendor; glare; glitter.
(Ra"di*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.
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