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Answer: steradian
Answer	Crossword Clue
steradian	The SI unit of solid angle, equal to the angle at the center of a sphere subtended by a part of the surface equal in area to the square of the radius
steradian	a unit of measurement for solid angles

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: steradian