Definition of "colorimeter"

colorimeter

noun
plural colorimeters
1. Any of various instruments designed to determine the color of something, by comparison with standard colors or by spectroscopy.
  Quotations
  It was, however, the need to distinguish specifically between different brown colours which led to the world's first colorimeter.
  2002, Victoria Finlay, Colour, Sceptre, published 2003, page 113
2. (analytical chemistry) An analytic instrument that estimates the concentration of a substance in a sample by measuring its color against the solution's complementary color.