steradian

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ste·ra·di·an (sr),

(stĕ-rā'dē-ăn),
The unit of solid angle; the solid angle that encloses an area on the surface of a sphere equivalent to the square of the radius of the sphere.
[G. stereos, solid, + radion, radius]

steradian

(stē-rā′dē-ăn)
The unit of measurement of solid angles. It encloses an area on the surface of a sphere equal to the square of the radius of the sphere.