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color index

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noun Astronomy.
the difference between the apparent photographic magnitude and the apparent visual magnitude of a star.
the difference between the magnitudes of a star in any two spectral regions.
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ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
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Question 1 of 8
Which of the following words describes “sky blue”?
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Origin of color index

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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