1) Angular unit 2) Unit of solid angle
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(str) A solid angle with vertex at the center of a sphere of radius r that encompasses an area of r
2 on the surface of the sphere.
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http://antoine.frostburg.edu/chem/senese/101/glossary/s.shtml
The steradian (symbol: sr) or squared radian is the SI unit of solid angle. It is used in three-dimensional space, and functions analogously to the manner in which the radian quantifies planar angles. The name is derived from the Greek stereos for `solid` and the Latin radius for `ray, beam`. The steradian, like the radian, is dimensionless, e...
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http://en.wikipedia.org/wiki/Steradian
unit of solid-angle measure in the International System of Units (SI), defined as the solid angle of a sphere subtended by a portion of the surface ... [1 related articles]
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http://www.britannica.com/eb/a-z/s/160
(sr) One of two supplementary (dimensionless) units in the SI system of units (the other being the radian). The steradian is a unit of solid angle. It is defined as the solid central angle of a sphere which encloses a surface on the sphere equal to the square of the sphere'...
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http://www.daviddarling.info/encyclopedia/S/steradian.html
SI unit of solid angle : Solid angle that, having its vertex at the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-01-20
The unit of solid angle; the solid angle that encloses an area on the surface of a sphere equivalent to the square of the radius of the sphere. ... Origin: G. Stereos, solid, + radion, radius ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(sr) The unit of solid angle subtended by an area on the surface of a sphere equal the square of the radius of the sphere. One steradian can be visualized as a conic section with a solid angle of approximately 66
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http://www.intl-lighttech.com/support/glossary
(sr) Type: Term Pronunciation: stĕ-rā′dē-ăn Definitions: 1. The unit of solid angle; the solid angle that encloses an area on the surface of a sphere equivalent to the square of the radius of the sphere.
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http://www.medilexicon.com/medicaldictionary.php?t=84885
[
n] - the unit of solid angle adopted under the System International d`Unites
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http://www.webdictionary.co.uk/definition.php?query=steradian
An SI supplementary unit.The steradian is the solid angle, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of equal length to the radius of the sphere.The surface of a sphere subtends an angle of 4 steradians at its centre.
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https://www.encyclo.co.uk/local/20687
sr noun the unit of solid angle adopted under the Systeme International d`Unites
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https://www.encyclo.co.uk/local/20974
SI unit of measure of solid (three-dimensional) angles, the three-dimensional equivalent of the radian. One steradian is the angle at the centre of a sphere when an area on the surface of the sphere equal to the square of the sphere's radius is joined to the centre
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https://www.encyclo.co.uk/local/21221
The unit of "stereo angle" or solid angle, the angle in three dimensions. It is related to the radian, which is the unit of angle in two dimensions (abbreviated "sterad").
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https://www.encyclo.co.uk/local/21257
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
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https://www.infoplease.com/dictionary/steradian
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