[′kəl·ər ′trī‚aŋ·gəl] (optics) A triangle on a chromaticity diagram that represents the range of chromaticities that can be obtained as additive mixtures of three prescribed primary colors represented by the corners of the triangle.
color triangle
col·or tri·an·gle
(kŭl'ŏr trī'ang-gĕl), A graph on which chromaticity coordinates are plotted.