ALL meanings of colour index
col·our in·dex
C c - noun colour index 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 3
- noun colour index the sum of the dark or coloured minerals of a rock, expressed as a percentage of the total minerals 3
- noun colour index a systematic arrangement of colours according to their hue, saturation, and brightness 3