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[rey-dee-uh nt] /ˈreɪ di ənt/
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.
  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.
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.
Origin of radiant
late Middle English
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
1. beaming, refulgent, resplendent.
1. dim.
Synonym Study
1. See bright. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for radiantly
Contemporary Examples
Historical Examples
  • She put her hands on David's shoulders, and looked at him radiantly.

    Tiverton Tales Alice Brown
  • And then I saw that Harry was a new Harry altogether, and that he was radiantly happy.

    The Comrade In White W. H. Leathem
  • The moon, drooping in the western board, looked at her radiantly.

  • "I've been looking for you everywhere, Miss Pat," she said radiantly.

    Miss Pat at School

    Pemberton Ginther
  • How fair and fresh and beautiful she was, garlanded with flowers and radiantly happy.

    The Trail of '98

    Robert W. Service
  • I am radiantly ready now, and there are seven still and shining hours ahead.

    Jane Journeys On Ruth Comfort Mitchell
  • Nash hesitated not a moment; his answer was radiantly there.

    The Tragic Muse

    Henry James
  • "Jimps, I'm perfectly contented," she said radiantly, as they walked on.

    Under the Country Sky Grace S. Richmond
  • She had been so truly wretched an hour ago, and now how radiantly happy she was.

    Isabel Leicester Clotilda Jennings
British Dictionary definitions for radiantly


sending out rays of light; bright; shining
characterized by health, intense joy, happiness, etc: a radiant countenance
emitted or propagated by or as radiation; radiated: radiant heat
sending out heat by radiation: a radiant heater
(physics) (of a physical quantity in photometry) evaluated by absolute energy measurements: radiant flux, radiant efficiency Compare luminous
a point or object that emits radiation, esp the part of a heater that gives out heat
(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 radiantly



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.



"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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radiantly in Medicine

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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radiantly in Science
  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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