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Webster 1913 Edition

Noun.

[

Color

-meter

: cf. F.

colorimètre

An instrument for measuring the depth of the color of anything, especially of a liquid, by comparison with a standard liquid.

colorimeter ‎(plural colorimeters)

Any of various instruments designed to determine the color of something, by comparison with standard colors or by spectroscopy.
(analytical chemistry) An analytic instrument that estimates the concentration of a substance in a sample by measuring its color against the solution's complimentary color.

instrument designed to determine color