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| ste·ra·di·an [ stə ráydee ən ] (plural ste·ra·di·ans) |
noun |
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| Definition: |
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SI measurement of solid angle: the basic International System unit of measurement of a solid angle in a sphere. One steradian is the solid angle made at the center of a sphere by an area on the surface of the sphere equal to the square of the sphere's radius.
Symbol sr
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| [Late 19th century. <stereo- + radian] |
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