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radiant

[rey-dee-uh nt]
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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.
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noun
  1. a point or object from which rays proceed.
  2. Astronomy. the point in the heavens from which a shower of meteors appears to radiate.
  3. a refractory absorbing and radiating heat from the flames of a gas fireplace or the like.
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Origin of radiant

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 formsra·di·ant·ly, adverban·ti·ra·di·ant, adjectivenon·ra·di·ant, adjectivenon·ra·di·ant·ly, adverbsu·per·ra·di·ant, adjectiveun·ra·di·ant, adjective

Synonyms

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1. beaming, refulgent, resplendent.

Synonym study

1. See bright.

Antonyms

1. dim.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for radiant

Contemporary Examples

Historical Examples

  • He looked upward with a radiant expression, and feebly pressed her hand.

    Philothea

    Lydia Maria Child

  • Gilder sprang to his feet, his face suddenly grown younger, radiant.

    Within the Law

    Marvin Dana

  • She was obliged to go, and to appear all radiant with pleasure.

  • To the widow of Mr Verloc the robust anarchist was like a radiant messenger of life.

    The Secret Agent

    Joseph Conrad

  • There is a radiant picture of this morning ride still fresh in my memory.

    In the Valley

    Harold Frederic


British Dictionary definitions for radiant

radiant

adjective
  1. sending out rays of light; bright; shining
  2. characterized by health, intense joy, happiness, etca radiant countenance
  3. emitted or propagated by or as radiation; radiatedradiant heat
  4. sending out heat by radiationa radiant heater
  5. physics (of a physical quantity in photometry) evaluated by absolute energy measurementsradiant flux; radiant efficiency Compare luminous
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noun
  1. a point or object that emits radiation, esp the part of a heater that gives out heat
  2. astronomy the point in space from which a meteor shower appears to emanate
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Derived Formsradiantly, 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

Word Origin and History for 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.

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n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

radiant in Medicine

radiant

(rādē-ənt)
adj.
  1. Emitting heat or light.
  2. Consisting of or emitted as radiation.
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n.
  1. A point from which light radiates to the eye.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

radiant in Science

radiant

[rādē-ənt]
Adjective
  1. Transmitting light, heat, or other radiation. Stars, for example, are radiant bodies.
  2. Consisting of or transmitted as radiation.
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Noun
  1. The apparent celestial origin of a meteor shower. For example, a point in the constellation Gemini is the radiant of the Geminid meteor shower.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.