Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Leucism" Definition
noun
An animal condition characterized by reduced pigmentation.
Source: Wiktionary
In zoology, whiteness resulting from lack or loss of coloring; albinism, partial or complete: a technical term, correlated with melanism and erythrism. see albinism.
Source: Century Dictionary
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