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radiant

[rey-dee-uh nt] /ˈreɪ di ənt/
adjective
1.
emitting rays of light; shining; bright:
the radiant sun; radiant colors.
2.
bright with joy, hope, etc.:
radiant smiles; a radiant future.
3.
Physics. emitted or propagated by radiation.
4.
Heraldry.
  1. noting a partition line having a series of flamelike indentations formed by ogees joined in zigzags; rayonny.
  2. (of a charge, as an ordinary) having an edge or edges so formed.
noun
5.
a point or object from which rays proceed.
6.
Astronomy. the point in the heavens from which a shower of meteors appears to radiate.
7.
a refractory absorbing and radiating heat from the flames of a gas fireplace or the like.
Origin
late Middle English
1400-1450
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
Related forms
radiantly, adverb
antiradiant, adjective
nonradiant, adjective
nonradiantly, adverb
superradiant, adjective
unradiant, adjective
Synonyms
1. beaming, refulgent, resplendent. See bright.
Antonyms
1. dim.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for more antiradiant

radiant

/ˈreɪdɪənt/
adjective
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) (of a physical quantity in photometry) evaluated by absolute energy measurements: radiant flux, radiant efficiency Compare luminous
noun
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
Derived Forms
radiantly, adverb
Word Origin
C15: from Latin radiāre to shine, from radius ray of light, radius
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for more antiradiant

radiant

adj.

mid-15c., from Middle French radiant and directly from Latin radiantem (nominative radians) "beaming, shining," present participle of radiare "to beam, shine" (see radiation). Of beauty, etc., first attested c.1500. Related: Radiantly.

n.

"point or object from which light radiates," 1727; see radiant (adj.). In astronomy, of meteor showers, from 1864.

Online Etymology Dictionary, © 2010 Douglas Harper
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more antiradiant in Medicine

radiant ra·di·ant (rā'dē-ənt)
adj.

  1. Emitting heat or light.

  2. Consisting of or emitted as radiation.

n.
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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more antiradiant in Science
radiant
  (rā'dē-ənt)   
Adjective  
  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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