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.

Origin of color index

First recorded in 1920–25

Words nearby color index

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

Example sentences from the Web for color index