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color index

noun, Astronomy
1.
the difference between the apparent photographic magnitude and the apparent visual magnitude of a star.
2.
the difference between the magnitudes of a star in any two spectral regions.
Origin of color index
1920-1925
1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for color

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