xanthochroismn./zænˈθɒkrəʊɪz(ə)m/Ornithology abnormal replacement of another colour by yellow in the plumage of certain birds.
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xanthochroism1893
1893 A. Newton et al. Dict. Birds: Pt. II 421 There seems to be a certain correlation of colours in most cases of Heterochrosis:..green feathers exhibit xanthochroism.