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Definition of Colour triangle
1. Noun. 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, white is in the middle. ¹
¹ Source: wiktionary.com
Medical Definition of Colour triangle
1. A graph on which chromaticity coordinates are plotted. (05 Mar 2000)