steradian
[ stuh-rey-dee-uh n ]
/ stəˈreɪ di ən /
noun Geometry.
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. Abbreviation: sr
Words nearby steradian
stepson,
stepstool,
steptoe,
stepwise,
ster.,
steradian,
sterco-,
stercobilin,
stercolith,
stercoraceous,
stercoraceous vomiting
British Dictionary definitions for steradian
steradian
/ (stəˈreɪdɪən) /
noun
an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius
Symbol: sr
Word Origin for steradian
C19: from
stereo- +
radian
Scientific definitions for steradian
steradian
[ stĭ-rā′dē-ən ]
A unitless measure of solid angles. A solid angle projecting from the center of a sphere and cutting its surface has a measure ofsr2 steradians, where s is the surface area of the sphere cut out by the solid angle, and r is the radius of the sphere. See also radian.