1: abnormal coloration of feathers (as in some parrots) in which yellow replaces the normal color
2: a genetic variation in various vertebrates characterized by local or general absence of black and brown pigment with normal development of the red and golden pigments (as of skin or feathers) resulting in a yellow to reddish coloration
History and Etymology for xanthochroism
New Latin xanthochroia yellow skin discoloration (from Greek xanthochroos xanthochroous + New Latin -ia) + English -ism