The most common and most likely answer to this crossword clue is the 9 letter word STERADIAN
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More clues leading to the result STERADIAN
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The cryptic/wordplay part
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What does STERADIAN mean?
STERADIAN noun- In the International System of Units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r2. Symbol: sr