Definition of colour index in English:

colour index

(US color index)

noun

1Medicine the ratio of the quantity of haemoglobin to the number of red blood cells present in a blood sample (now rare).
2Astronomy a number representative of the colour (and hence the temperature) of a star, equal to the difference in its magnitude (brightness) at two chosen wavelengths, typically blue and green-yellow, or ultraviolet and blue.
3Geology a number expressing the percentage of dark-coloured minerals (typically ferromagnesian ones) in an igneous rock.

Origin

Mid 19th century; earliest use found in British Journal Homoeopathy.

Definition of colour index in US English:

colour index

(US color index)

noun

1Medicine the ratio of the quantity of haemoglobin to the number of red blood cells present in a blood sample (now rare).
2Astronomy a number representative of the colour (and hence the temperature) of a star, equal to the difference in its magnitude (brightness) at two chosen wavelengths, typically blue and green-yellow, or ultraviolet and blue.
3Geology a number expressing the percentage of dark-coloured minerals (typically ferromagnesian ones) in an igneous rock.

Origin

Mid 19th century; earliest use found in British Journal Homoeopathy.

单词	colour index
释义	Definition of colour index in English: colour index (US color index) noun 1Medicine the ratio of the quantity of haemoglobin to the number of red blood cells present in a blood sample (now rare). 2Astronomy a number representative of the colour (and hence the temperature) of a star, equal to the difference in its magnitude (brightness) at two chosen wavelengths, typically blue and green-yellow, or ultraviolet and blue. 3Geology a number expressing the percentage of dark-coloured minerals (typically ferromagnesian ones) in an igneous rock. Origin Mid 19th century; earliest use found in British Journal Homoeopathy. Definition of colour index in US English: colour index (US color index) noun 1Medicine the ratio of the quantity of haemoglobin to the number of red blood cells present in a blood sample (now rare). 2Astronomy a number representative of the colour (and hence the temperature) of a star, equal to the difference in its magnitude (brightness) at two chosen wavelengths, typically blue and green-yellow, or ultraviolet and blue. 3Geology a number expressing the percentage of dark-coloured minerals (typically ferromagnesian ones) in an igneous rock. Origin Mid 19th century; earliest use found in British Journal Homoeopathy.
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