(literally) The color of human skin. / (figuratively) One's ethnicity.

(American spelling) Alternative form of color blind

(of a person or animal) Unable to distinguish between two or more primary colors (usually red and green).

(American spelling, physics) In the Standard Model of particle physics, a property possessed by quarks, antiquarks, and gluons that determine rules for how these particles may interact. There are three pairs of colors and anticolors: red, green, blue, and their corresponding anti-colors (e.g. anti-red).

(American spelling) Alternative form of color coordinated

(printing) A printing process which uses four specific colored inks: cyan, magenta, yellow and black (CMYK), and halftone printing plates, to reproduce a range of colors.

(American spelling) Alternative form of colour triangle

(US) Alternative spelling of colour wheel

(pathology) Any of several medical conditions in which the physical ability to see colors is impaired, especially achromatopsia, Daltonism. / (figuratively) Indifference to a person's skin color or race.

Of the wrong color. / (idiomatic) Dirty, vulgar or obscene, especially in a way that is unpleasant. / (idiomatic) Different than usual. / (idiomatic) Feeling mildly unwell.