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.

QUIZ

ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?

We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.

Question 1 of 8

Which of the following words describes “sky blue”?

navy

beryl

azure

TAKE THE QUIZ TO FIND OUT

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Origin of color index

First recorded in 1920–25

Words nearby color index

color hearing, color hemianopsia, colorific, colorimeter, colorimetry, color index, coloring, coloring book, colorism, colorist, colorize

How to use color index in a sentence

Even other men of color considered Revels a curious figure, for Mississippi had never had a large free black population.
The Black Man Who Replaced Jefferson Davis in the Senate|Philip Dray|January 7, 2015|DAILY BEAST
Similarly, a recent NPR report covered the challenges many police departments are having recruiting officers of color.
How to Solve the Policing Crisis|Keli Goff|January 5, 2015|DAILY BEAST
The losers have always been children in poverty, children of color, and children with disabilities.
The ‘No Child’ Rewrite Threatens Your Kids’ Future|Jonah Edelman|January 3, 2015|DAILY BEAST
In Brazil people color code their underwear according to their needs.
New Year’s Eve, Babylon Style|Candida Moss|December 31, 2014|DAILY BEAST

She says that every film she makes, she has to hit someone—The Color Purple, The Butler, and Selma.
Ava DuVernay on ‘Selma,’ the Racist Sony Emails, and Making Golden Globes History|Marlow Stern|December 15, 2014|DAILY BEAST
The pink flowers are the largest while those of a yellow color are the smallest.
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce|E. R. Billings.
She was growing accustomed to like shocks, but she could not keep the mounting color back from her cheeks.
The Awakening and Selected Short Stories|Kate Chopin
Her attachment to impressionism leads this artist to many experiments in color—or, as one critic wrote, "to play with color."
Women in the fine arts, from the Seventh Century B.C. to the Twentieth Century A.D.|Clara Erskine Clement
She also practises etching, pen-and-ink drawing, as well as crayon and water-color sketching.
Women in the fine arts, from the Seventh Century B.C. to the Twentieth Century A.D.|Clara Erskine Clement
They are succeeded by kidney shaped capsules of a brown color.
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce|E. R. Billings.