| anomalous trichromatism | A defect in colour perception in which there appears to be an abnormality or deficiency in one of the three primary pigments of the retinal cones. See: protanomaly, deuteranomaly, tritanomaly. (05 Mar 2000) |
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| trichromatism | <zoology> The quality, state, or phenomenon of being trichromatic. Source: Websters Dictionary (01 Mar 1998) |