steradian
/stəˈɹeɪ.diən/
STƏɹEꞮ · diən (2 syllables)
English
Noun
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Definition
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
Etymology
ste(reo) + radian
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