radiant

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Emitting heat or light.
2. adj. Consisting of or emitted as radiation: radiant heat.
3. adj. Filled with light; bright.
4. adj. Glowing; beaming. See Synonyms at bright.
5. n. An object or a point from which light or heat rays are emitted.
6. n. Astronomy The apparent celestial origin of a meteoric shower.

Century Dictionary and Cyclopedia

1. Darting, shooting, or emitting rays of light or heat; shining; sparkling: beaming with brightness, literally or figuratively: as, the radiant sun; a radiant countenance.
2. Giving out rays; proceeding in the form of rays; resembling rays; radiating; also, radiated; radiate: as, radiant heat.
3. In heraldry:
4. Edged with rays: said of an ordinary or other bearing such as is usually bounded with straight lines, the rays generally appearing like long indentations. See ray, 8.
5. Giving off rays, which do not form a broken or indented edge to the bearing, but stream from it, its outline being usually perfect and the rays apparently streaming from behind it.
6. In botany, radiating; radiate.
7. Synonyms Beaming, resplendent. See radiance.
8. n. In optics, a luminous point or object from which light radiates to the eye, or to a mirror or lens; a point considered as the focus of a pencil of rays.
9. n. In astronomy, the point in the heavens from which the shooting-stars of a meteoric shower seem to proceed: thus, the radiant of the shower of November 13th is near the star ζ Leonis, and these meteors are hence called the Leonides. Similarly the meteors of November 27th (which are connected with Biela's comet, and are often called the Bielides) have their radiant not far from γ Andromedæ, and are also known as the Andromedes or Andromedids.
10. n. In geometry, a ray conceived as revolving about its starting-point.
11. n. A substance that emits rays, specifically N-rays.

Wiktionary

1. adj. Radiating light and/or heat.
2. adj. Emitted as radiation.
3. adj. Bright, glowing or filled with light.
4. n. A point source from which radiation is emitted.
5. n. astronomy The apparent origin, in the night sky, of a meteor shower.
6. n. A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.

GNU Webster's 1913

1. adj. Emitting or proceeding as from a center; resembling rays; radiating; radiate.
2. adj. Especially, emitting or darting rays of light or heat; issuing in beams or rays; beaming with brightness; emitting a vivid light or splendor.
3. adj. Beaming with vivacity and happiness.
4. adj. (Her.) Giving off rays; -- said of a bearing
5. adj. (Bot.) Having a raylike appearance, as the large marginal flowers of certain umbelliferous plants; -- said also of the cluster which has such marginal flowers.
6. adj. (Physics) Emitted or transmitted by radiation.
7. n. (Opt.) The luminous point or object from which light emanates; also, a body radiating light brightly.
8. n. (Geom.) A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.
9. n. (Astron.) The point in the heavens at which the apparent paths of shooting stars meet, when traced backward, or whence they appear to radiate.

WordNet 3.0

1. adj. radiating or as if radiating light