Radial
(Ra"di*al) a. [Cf. F. radial. See Radius.] Of or pertaining to a radius or ray; consisting of, or
like, radii or rays; radiated; as, (Bot.) radial projections; (Zoöl.) radial vessels or canals; (Anat.) the
radial artery.
Radial symmetry.
(Biol.) See under Symmetry.
Radiale
(||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.
Radially
(Ra"di*al*ly) adv. In a radial manner.
Radian
(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.
Radiance
(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,
What light beyond compare !
Neale. Syn. — Luster; brilliancy; splendor; glare; glitter.
Radiant
(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.
Radiant
(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.