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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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Word History and Origins
Origin of color index1
First recorded in 1920–25
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Example Sentences
A low color-index probably indicates a mild type of the disease.
From Project Gutenberg
The color-index is thus almost invariably low, the average being about 0.5.
From Project Gutenberg
The changes in hemoglobin and red cells resemble those of a moderate symptomatic anemia, with rather low color-index.
From Project Gutenberg
The color index is most significant in chlorosis and pernicious anemia.
From Project Gutenberg
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