An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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steradian (sr)
  استرادیان  
esterâdiân (#)
Fr.: stéradian  

The solid angle subtended at the center of a sphere by an area on its surface numerically equal to the square of the radius. → square degree.

See also: From ste(reo)-, → stereo-