color index
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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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
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences 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