Trichromatism.
Heterochromia is the condition of two colors, especially of the iris.
The primary colors are blue, red, and yellow. These colors are considered fundamental because they cannot be created by mixing other colors together.
Hetero- is the medical terminology combining form meaning unlike or different. For instance, heterosexual refers to someone sexually attracted to the opposite sex. Heterochromia means different colors.
Alcohol can reduce your ability to distinguish colours, especially red and green.
Bicolor would be a word meaning two colors.
All colors visible to the human eye are in the rainbow. They have no specific meaning.
any of a group of colors from which all other colors can be obtained by mixing.
Rods
Chromatic.
Two colors.
The term is "passed with flying colors" meaning by a wide margin.
http://www.elizabethan-era.org.uk/meaning-colors