radiant(s = adj.all) beaming, beamy, effulgent, refulgent - radiating or as if radiating light; "the beaming sun"; "the effulgent daffodils"; "a radiant sunrise"; "a refulgent sunset"
Derived forms noun radiance₂, noun radiancy₁, verb radiate₇, verb radiate₅, verb radiate₁

1.  Emitting or proceeding as from a center; resembling rays; radiating; radiate. [1913 Webster]

2.  Especially, emitting or darting rays of light or heat; issuing in beams or rays; beaming with brightness; emitting a vivid light or splendor; as, the radiant sun. [1913 Webster]
"Mark what radiant state she spreads." [1913 Webster]

3.  Beaming with vivacity and happiness; as, a radiant face. [1913 Webster]

4.  Giving off rays; -- said of a bearing; as, the sun radiant; a crown radiant. [1913 Webster]

5.  Having a raylike appearance, as the large marginal flowers of certain umbelliferous plants; -- said also of the cluster which has such marginal flowers. [1913 Webster]

6.  Emitted or transmitted by radiation; as, a radiant energy; radiant heat. [Webster 1913 Suppl.]

1.  The luminous point or object from which light emanates; also, a body radiating light brightly. [1913 Webster]

2.  A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve. [1913 Webster]

3.  The point in the heavens at which the apparent paths of shooting stars meet, when traced backward, or whence they appear to radiate. [1913 Webster]

radiant, adj. & n.
--adj.
1 emitting rays of light.
2 (of eyes or looks) beaming with joy or hope or love.
3 (of beauty) splendid or dazzling.
4 (of light) issuing in rays.
5 operating radially.
6 extending radially; radiating.
--n.
1 the point or object from which light or heat radiates, esp. in an electric or gas heater.
2 Astron. a radiant point.

Idiom:
radiant heat heat transmitted by radiation, not by conduction or convection. radiant heater a heater that works by this method. radiant point
1 a point from which rays or radii proceed.
2 Astron. the apparent focal point of a meteor shower.

Derivative:
radiance n. radiancy n. radiantly adv.

Etymology:
ME f. L radiare (as RADIUS)

N  repute, distinction, mark, name, figure, repute, reputation, good repute, high repute, note, notability, notoriety, eclat, the bubble reputation, vogue, celebrity, fame, famousness, renown, popularity, aura popularis, approbation, credit, succes d'estime, prestige, talk of the town, name to conjure with, glory, honor, luster, illustriousness, account, regard, respect, reputableness, respectability, good name, good report, fair name, dignity, stateliness, solemnity, grandeur, splendor, nobility, majesty, sublimity, rank, standing, brevet rank, precedence, pas, station, place, status, position, position in society, order, degree, baccalaureate, locus standi, caste, condition, greatness, eminence, height, importance, preeminence, supereminence, high mightiness, primacy, top of the ladder, top of the tree, elevation, ascent, superaltation, exaltation, dignification, aggrandizement, dedication, consecration, enthronement, canonization, celebration, enshrinement, glorification, hero, man of mark, great card, celebrity, worthy, lion, rara avis, notability, somebody, classman, man of rank, pillar of the state, pillar of the church, pillar of the community, chief, first fiddle, cynosure, mirror, flower, pink, pearl, paragon, choice and master spirits of the age, elite, star, sun, constellation, galaxy, ornament, honor, feather in one's cap, halo, aureole, nimbus, halo of glory, blaze of glory, blushing honors, laurels, memory, posthumous fame, niche in the temple of fame, immortality, immortal name, magni nominis umbra, distinguished, distingue, noted, of note, honored, popular, fashionable, in good odor in, favor, in high favor, reputable, respectable, creditable, remarkable, notable, notorious, celebrated, renowned, ion every one's mouth, talked of, famous, famed, far-famed, conspicuous, to the front, foremost, in the front rank, in the ascendant, imperishable, deathless, immortal, never fading, aere perennius, time honored, illustrious, glorious, splendid, brilliant, radiant, bright, full-blown, honorific, eminent, prominent, high, in the zenith, at the head of, at the top of the tree, peerless, of the first water, superior, supereminent, preeminent, great, dignified, proud, noble, honorable, worshipful, lordly, grand, stately, august, princely, imposing, solemn, transcendent, majestic, sacred, sublime, heaven- born, heroic, sans peur et sans reproche, sacrosanct, Int, hail!, all hail!, ave!, viva!, vive!, long life to!, banzai!, glory be to, honor be to?, one's name being in every mouth, one's name living for ever, sic itur ad astra, fama volat, aut Caesar aut nullus, not to know him argues oneself unknown, none but himself could be his parallel, palmam qui meruit ferat, above all Greek above all Roman fame, cineri gloria sera est, great is the glory for the strife is hard, honor virtutis praemium, immensum gloria calcar habet, the glory dies not and the grief is past, vivit post funera virtus.

N  divergence, divergency, divarication, ramification, forking, radiation, separation, dispersion, deviation, aberration, diverging, divergent, radiant, centrifugal, aberrant.

N  light, ray, beam, stream, gleam, streak, pencil, sunbeam, moonbeam, aurora, day, sunshine, light of day, light of heaven, moonlight, starlight, sunlight, daylight, broad daylight, noontide light, noontide, noonday, noonday sun, glow, glimmering, glint, play of light, flood of light, phosphorescence, lambent flame, flush, halo, glory, nimbus, aureola, spark, scintilla, facula, sparkling, emication, scintillation, flash, blaze, coruscation, fulguration, flame, lightning, levin, ignis fatuus, luster, sheen, shimmer, reflexion, reflection, gloss, tinsel, spangle, brightness, brilliancy, splendor, effulgence, refulgence, fulgor, fulgidity, dazzlement, resplendence, transplendency, luminousness, luminosity, lucidity, renitency, nitency, radiance, radiation, irradiation, illumination, actinic rays, actinism, Roentgen-ray, Xray, photography, heliography, photometer, optics, photology, photometry, dioptrics, catoptrics, chiaroscuro, clairobscur, clear obscure, breadth, light and shade, black and white, tonality, reflection, refraction, dispersion, refractivity, shining, luminous, luminiferous, lucid, lucent, luculent, lucific, luciferous, light, lightsome, bright, vivid, splendent, nitid, lustrous, shiny, beamy, scintillant, radiant, lambent, sheen, sheeny, glossy, burnished, glassy, sunny, orient, meridian, noonday, tide, cloudless, clear, unclouded, unobscured, gairish, garish, resplendent, transplendent, refulgent, effulgent, fulgid, fulgent, relucent, splendid, blazing, in a blaze, ablaze, rutilant, meteoric, phosphorescent, aglow, bright as silver, light as day, bright as day, light as noonday, bright as noonday, bright as the sun at noonday, actinic, photogenic, graphic, heliographic, heliophagous, a day for gods to stoop and men to soar, dark with excessive bright.

N  luminary, light, flame, spark, scintilla, phosphorescence, fluorescence, sun, orb of day, Phoebus, Apollo, Aurora, star, orb, meteor, falling star, shooting star, blazing star, dog star, Sirius, canicula, Aldebaran, constellation, galaxy, zodiacal light, anthelion, day star, morning star, Lucifer, mock sun, parhelion, phosphor, phosphorus, sun dog, Venus, aurora, polar lights, northern lights, aurora borealis, southern lights, aurora australis, lightning, chain lightning, fork lightning, sheet lightning, summer lightning, ball lightning, kugelblitz, phosphorus, yellow phosphorus, scintillator, phosphor, firefly luminescence, ignis fatuus, Jack o'lantern, Friar's lantern, will-o'-the- wisp, firedrake, Fata Morgana, Saint Elmo's fire, glowworm, firefly, June bug, lightning bug, anglerfish, gas, gas light, lime light, lantern, lanthorn, dark lantern, bull's-eye, candle, bougie, taper, rushlight, oil, wick, burner, Argand, moderator, duplex, torch, flambeau, link, brand, gaselier, chandelier, electrolier, candelabrum, candelabra, girandole, sconce, luster, candlestick, lamp, light, incandescent lamp, tungsten bulb, light bulb, flashlight, torch, arc light, laser, maser neon bulb, neon sign, fluorescent lamp, filament, socket, contacts, filler gas, firework, fizgig, pyrotechnics, rocket, lighthouse, self-luminous, glowing, phosphoric, phosphorescent, fluorescent, incandescent, luminescent, chemiluminescent, radiant, blossomed the lovely stars, the forget-me-nots of the angels, the sentinel stars set their watch in the sky, the planets in their station list'ning stood, the Scriptures of the skies, that orbed continent, the fire that severs day from night.

radiant energy, radiant engine, radiant flux, radiant heating