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steradiancy

noun
ste·​ra·​di·​an·​cy | \ stə̇ˈrādēənsē\
plural -es

Definition of steradiancy

: the radiant flux from a surface per steradian of solid angle in a specified direction per unit area of cross section of the emission perpendicular to that direction

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History and Etymology for steradiancy

steradian + -cy

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