colour index
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
geology the sum of the dark or coloured minerals of a rock, expressed as a percentage of the total minerals
chem physics a systematic arrangement of colours according to their hue, saturation, and brightness
Words Nearby colour index
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use colour index in a sentence
Instead of s there may also be used another expression for the colour, called the colour-index.
Lectures on Stellar Statistics | Carl Vilhelm Ludvig CharlierThe difference between the photographic and the visual magnitudes is called the colour-index (c).
Lectures on Stellar Statistics | Carl Vilhelm Ludvig CharlierFrom each catalogue of visual magnitudes of the stars we may obtain their photographic magnitude through adding the colour-index.
Lectures on Stellar Statistics | Carl Vilhelm Ludvig Charlier
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