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WordReference Random House Unabridged Dictionary of American English © 2024di•chro•ma•tism (dī krō′mə tiz′əm),USA pronunciation n. - Optics, Zoologythe quality or state of being dichromatic.
Also called di•chro•ma•top•si•a (dī krō′mə top′sē ə).USA pronunciation [Ophthalm.]a defect of vision in which the retina responds to only two of the three primary colors. Cf. monochromatism (def. 2), trichromatism (def. 3).- dichromat(ic) + -ism 1880–85
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