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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. See bright.
1. dim. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for radiantly
Contemporary Examples
Historical Examples
  • Still standing with downcast eyes he could not know how radiantly she appeared before him.

    Everychild Louis Dodge
  • She put her hands on David's shoulders, and looked at him radiantly.

    Tiverton Tales Alice Brown
  • Morning was coming as radiantly as if there were no sorrow in the world.

    Peggy Raymond's Vacation Harriet L. (Harriet Lummis) Smith
  • 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 little two-year-old son of the dead man had a stick, and was chasing some ducks toward the brook; he was radiantly happy.

    The Amazing Argentine John Foster Fraser
  • The moon, drooping in the western board, looked at her radiantly.

  • But it was not necessary for Agnes to repeat that she was radiantly happy.

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

    Miss Pat at School Pemberton Ginther
  • But the inspiration, if it exist anywhere, flashes on the knight's shield quite as radiantly as on the monk's picture.

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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