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2017 Word of the Year

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
First recorded in 1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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7
9
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