steradian

noun
ste·​ra·​di·​an | \ sti-ˈrād-ē-ən How to pronounce steradian (audio) \

Medical Definition of 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

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a usually brief trip or an expedition

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