What does "steradian" mean?

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

How do you pronounce "steradian"?

Pronounced //stəˈɹeɪ.diən//.

Steradian

//stəˈɹeɪ.diən// noun

noun ·Rare ·Advanced level

Definitions

Noun

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
the unit of solid angle adopted under the Systeme International d'Unites wordnet

Synonyms

All synonyms

Etymology

ste(reo) + radian

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.