| 释义 |
ste·ra·di·an
\stə̇ˈrādēən\ noun
also sterad \ˈsteˌrad, ˈstiˌr-\
(-s)
Etymology: steradian from stere- + radian; sterad short for steradian
: a unit of measure of solid angles that is expressed as the solid angle subtended at the center of the sphere by a portion of the surface whose area is equal to the square of the radius of the sphere |