ste·ra·di·an 
(stĭ-rādē-ən)
(stĭ-rādē-ən)n. 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.
[STE(REO)- + RADIAN.]
steradianIf A = r2 then solid angle Ω = 1 sr.
- submediant
- submerge
- submerged
- submergence
- submergibility
- submergible
- submerse
- submersed
- submersible
- submersion
- submicroscopic
- submicroscopically
- submillimeter radiation
- subminiature
- subminiaturization
- subminiaturize
- subminimum wage
- submiss
- submission
- submissive
- submissively
- submissiveness
- submit
- submittal
- submitter