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Radian vs Radiant - What's the difference?

radian | radiant |

As nouns the difference between radian and radiant

is that radian is in the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad while radiant is a point source from which radiation is emitted.

As an adjective radiant is

radiating light and/or heat.

radian

English

Noun

(en noun)
  • (geometry) In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad

    • Derived terms

    * steradian

    See also

    * degree * gradian

    Anagrams

    * *

    External links

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    radiant

    English

    Adjective

    (en adjective)
  • Radiating light and/or heat.
  • :
  • Emitted as radiation.
  • Beaming with vivacity and happiness.
  • :
  • *
  • *:His sister, Mrs. Gerard, stood there in carriage gown and sables, radiant with surprise. ¶ “Phil?!  You?!   Exactly like you, Philip, to come strolling in from the antipodes—dear fellow?!” recovering from the fraternal embrace and holding both lapels of his coat in her gloved hands.
  • Emitting or proceeding as if from a center.
  • (lb) Giving off rays; said of a bearing.
  • :
  • (lb) Having a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers.

    • Noun

    (en noun)
  • A point source from which radiation is emitted.
  • (astronomy) The apparent origin, in the night sky, of a meteor shower.
  • A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.

    • Anagrams

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