primary color

noun
1.
Art. a color, as red, yellow, or blue, that in mixture yields other colors. Compare complementary color ( def 1 ), secondary color, tertiary color.
2.
Optics. any of a set of monochromatic colors, as red, green, and blue, that are added to match or specify the chromaticity of a stimulus or sample.

Origin:
1605–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To primary color
American Heritage
Science Dictionary
primary color  
Any of a group of colors from which all other colors can be made by mixing. See more at additive, subtractive. See Note at color.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Example sentences
Gang members have learned that wearing one primary color, such as red or blue,
  makes them too identifiable.
Rather than the primary color being a shade of brown, the shingles reflected an
  overall blue hue.
Each canvas chair comes in the team's primary color and the headrest is in the
  teams secondary color.
Such claims are often accompanied by a pretty silhouette of a skull,
  highlighted with splotches of primary color.
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