# steradian

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## ste·ra·di·an

(stĭ-rā′dē-ən)*n.*

*Abbr.*

**sr**

A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared. The total solid angle of a sphere is 4π steradians.

## steradian

(stəˈreɪdɪən)*n*

(Units) 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. Symbol:

**sr**[C19: from stereo- + radian]

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Noun | 1. | steradian - the unit of solid angle adopted under the Systeme International d'Unitesangular unit - a unit of measurement for angles sphere - a three-dimensional closed surface such that every point on the surface is equidistant from the center |

Translations

**stéradian**

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