steradian

(stə rādē ən)

noun

the basic unit of solid angular measure in the SI system, equal to the solid angle subtended at the center of a sphere by an area, on its surface, that is equal to the square of its radius: one sphere equals 4π steradians: abbrev. sr

Origin: ste(reo)- + radian

See steradian in American Heritage Dictionary 4

noun Abbr. sr
A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared: The total solid angle of a sphere is 4π steradians. See Table at measurement.

Origin:

Origin: ste(reo)-

Origin: + radian

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