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steradian

[ stuh-rey-dee-uhn ]

noun

, Geometry.
  1. a solid angle at the center of a sphere subtending a section on the surface equal in area to the square of the radius of the sphere. : sr


steradian

/ stəˈreɪdɪən /

noun

  1. an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius sr


steradian

/ stĭ-rādē-ən /

  1. A unitless measure of solid angles. A solid angle projecting from the center of a sphere and cutting its surface has a measure of s r 2 steradians, where s is the surface area of the sphere cut out by the solid angle, and r is the radius of the sphere.
  2. See also radian


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Word History and Origins

Origin of steradian1

First recorded in 1880–85; ste(reo)- + radian
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Word History and Origins

Origin of steradian1

C19: from stereo- + radian

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-sterstercoraceous