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colour index

noun

  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” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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colour guardcolouring