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Munsell scale

British  
/ ˈmʌnsəl /

noun

  1. a standard chromaticity scale used in specifying colour. It gives approximately equal changes in visual hue

"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

Etymology

Origin of Munsell scale

C20: named after A. H. Munsell (1858–1918), US inventor