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# The unit of solid angle adopted under the System International d'Unites

Answer for the clue "The unit of solid angle adopted under the System International d'Unites ", 9 letters:

**steradian**

### Word definitions for steradian in dictionaries

**Wiktionary**
Word definitions in Wiktionary

n. (context geometry English) 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 ''r'' 2 . Symbol: sr

**WordNet**
Word definitions in WordNet

n. the unit of solid angle adopted under the Systeme International d'Unites [syn: sr ]

**Wikipedia**
Word definitions in Wikipedia

The steradian (symbol: sr ) or square radian is the SI unit of solid angle . It is used in three- dimensional geometry, and is analogous to the radian which quantifies planar angles . The name is derived from the Greek stereos for "solid" and the Latin ...

#### Usage examples of steradian.

A complete __steradian__ sweep showed nothing the size of a spaceship out there.

But given that, and assuming that everything else goes linearly, the best guesstimate I can make says we get hit with everything emerging from a solid angle of one two-hundredth of a __steradian__ of Alpha C.

That power radiated equally in all directions would be distributed over a sphere, which is divided into four pi units of solid angle called __steradians__.