(British spelling) A plane triangular graph on which are drawn all the colours that can be made by the additive mixing of red blue and green; these three primary colours are at the apices, while white is in the middle.

(British spelling) A planar circular chart in which related colours are adjacent, and complementary colors are opposite.

Britain standard spelling of color blindness.

Any substance added to food in order to change its colour.

(British spelling, colour science) Either of two colours which, when mixed, produce a white or grey.

(uncountable) A colour system of transmitting and receiving television signals. / (countable) A television set that displays images in colour.

The segregation of people of different colour or race, especially any barrier to black people participating in activities with white people.

Alternative spelling of sulfur-color

Alternative spelling of sulfur-colored

(British spelling) Any system where colours are used to categorize elements of sets.