
Primary colors (or primary colours) are sets of colors that can be combined to make a useful range of colors. For human applications, three primary colors are usually used, since human color vision is trichromatic. For additive combination of colors, as in overlapping projected lights or in CRT displays, the primary colors normally used are red, g...
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http://en.wikipedia.org/wiki/Primary_color

Type: Term Definitions: 1. the three colors of the retinal cone pigments (red, green, blue) that may be combined to match any hue. Synonyms: simple color
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http://www.medilexicon.com/medicaldictionary.php?t=19062

a color, as red, yellow, or blue, that in mixture yields other colors. Cf.(def. 1), · 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.
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https://www.infoplease.com/dictionary/primary-color
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