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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Nearby words

color filter, color force, color guard, color hearing, color hemianopsia, color index, color line, color of someone's money, see the, color phase, color radical, color scheme

Origin of color index

First recorded in 1920–25

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for color index

The color-index is thus almost invariably low, the average being about 0.5.
A Manual of Clinical Diagnosis|James Campbell Todd