xanthochroism


From The Collaborative International Dictionary of English v.0.48:

Xanthochroism \Xan*thoch"ro*ism\, n.
   Abnormal coloration of feathers in which yellow replaces the
   normal color, as in certain parrots. It is commonly due to
   lack of the dark pigment which with yellow forms green.
   [Webster 1913 Suppl.]
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