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.
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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.
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Example sentences
Bright primary colors are splashed across walls, and the furnishings tend
  toward minimalist and modern.
The fireflies all start as primary colors, and the frogs are all secondary and
  tertiary colors.
These low riding flips and sandals come in a bright array of primary colors as
  well as natural hues.
There are thousands of fundamental odors, far more than the handful of primary
  colors.
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