colour index

World English Dictionary
colour index
1.  astronomy the difference between the apparent magnitude of a star measured in one standard waveband and in a longer standard waveband, indicating its colour and temperature
2.  geology the sum of the dark or coloured minerals of a rock, expressed as a percentage of the total minerals
3.  chem, physics a systematic arrangement of colours according to their hue, saturation, and brightness

Collins English Dictionary - Complete & Unabridged 10th Edition
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