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

Origin of steradian

First recorded in 1880–85; ste(reo)- + radian

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.