Steradian

//stəˈɹeɪ.diən// noun

Definitions

Noun
  1. 1
    In the International System of Units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r². Symbol: sr
  2. 2
    the unit of solid angle adopted under the Systeme International d'Unites wordnet

Etymology

ste(reo) + radian

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