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emitting rays of light; shining; bright: the radiant sun; radiant colors.
bright with joy, hope, etc.: radiant smiles; a radiant future.
Physics. emitted or propagated by radiation.
noting a partition line having a series of flamelike indentations formed by ogees joined in zigzags; rayonny.
(of a charge, as an ordinary) having an edge or edges so formed.
a point or object from which rays proceed.
Astronomy. the point in the heavens from which a shower of meteors appears to radiate.
a refractory absorbing and radiating heat from the flames of a gas fireplace or the like.

1400–50; late Middle English < Latin radiant- (stem of radiāns, present participle of radiāre to radiate light, shine), equivalent to radi(us) beam, ray (see radius) + -ant- -ant

radiantly, adverb
antiradiant, adjective
nonradiant, adjective
nonradiantly, adverb
superradiant, adjective
unradiant, adjective

1. beaming, refulgent, resplendent. See bright.

1. dim. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
radiant (ˈreɪdɪənt)
1.  sending out rays of light; bright; shining
2.  characterized by health, intense joy, happiness, etc: a radiant countenance
3.  emitted or propagated by or as radiation; radiated: radiant heat
4.  sending out heat by radiation: a radiant heater
5.  physics Compare luminous (of a physical quantity in photometry) evaluated by absolute energy measurements: radiant flux; radiant efficiency
6.  a point or object that emits radiation, esp the part of a heater that gives out heat
7.  astronomy the point in space from which a meteor shower appears to emanate
[C15: from Latin radiāre to shine, from radius ray of light, radius]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1450, from M.Fr. radiant, from L. radiantem (nom. radians) "shining," prp. of radiare "to beam, shine" (see radiation). Of beauty, etc., first attested 1509. Radiance is 1601, from M.L. radiantia "brightness," from radiare. The verb radiate is attested from 1619.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

radiant ra·di·ant (rā'dē-ənt)

  1. Emitting heat or light.

  2. Consisting of or emitted as radiation.

A point from which light radiates to the eye.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
radiant   (rā'dē-ənt)  Pronunciation Key 
  1. Transmitting light, heat, or other radiation. Stars, for example, are radiant bodies.

  2. Consisting of or transmitted as radiation.

Noun   The apparent celestial origin of a meteor shower. For example, a point in the constellation Gemini is the radiant of the Geminid meteor shower.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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