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A partial loss of pigmentation in a human or other animal, resulting in white, pale, or patchy coloration of the skin, hair, fur, or feathers but not the eyes.

leu·cis′tic (-kĭs′tĭk) adj.
References in periodicals archive ?
This startling picture of the little owl, which is suffering from a problem known as leucism, was photographed close to Cleveland by Brian Martin.
Leucism occurs in quite a number of bird species, when the pigment in their genetic makeup is off.
Curator Richard Brown said: "We believe the baby has a condition called leucism, which means it's lacking in pigment resulting in the white looking coat.
More likely it's an example of flavism, similar but much rarer in birds than leucism, which causes white feathers in dark birds.
Leucism is a double-recessive trait (Cruickshank and Robinson 1997); hence, normally colored parents have the potential to produce leucistic offspring, but the genetics of albinism should not be confused with the genetics of leucism (Searle 1968).
There are more than five million grey squirrels in Britain, but wildlife experts reckon fewer than one in a million are born with the leucism gene that makes them white.
The snapper had leucism, which is the condition of missing multiple kinds of skin pigmentation, resulting in whitish, pale skin.
However, the latter condition and its name have been deemed obsolete, and "partial albinism" is now preferentially known as leucism (Abreu et al.
Leucism is caused by a recessive gene that blocks melanin synthesis, but rarely affects hairless body parts such as the nose, feet, and exposed skin and never affects the iris (Miller, 2005).
Many of these feathers and some greater coverts had white tips, evidently leucism.
Spots had a rare genetic condition called leucism (LOO'-sih-zem) that reduces the color pigmentation in the skin.
Leucism in the giant fruit-eating bat (Artibeus lituratus Olfers, 1818) in the state of Hidalgo, Mexico.