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Noun: primary color
Usage: US (elsewhere: primary colour)
  1. Any of three colors from which all others can be obtained by mixing
    "Red, blue, and yellow are considered primary colors in traditional color theory";
    - primary colour [Brit, Cdn]

Derived forms: primary colors

Type of: color [US], coloring [US], colour [Brit, Cdn], colouring [Brit, Cdn]

Encyclopedia: Primary color