colour index
Britishnoun
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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
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geology the sum of the dark or coloured minerals of a rock, expressed as a percentage of the total minerals
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chem physics a systematic arrangement of colours according to their hue, saturation, and brightness
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Cheaper LEDs will have a lower colour index of about 80, whereas daylight is about 100,” says Storey.
From The Guardian ● Nov. 10, 2020
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
