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Meaning of steradian

ste•ra•di•an

Pronunciation: (stu-rā'dē-un), [key]
— n. Geom.
  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. Abbr.: sr
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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