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melanism (n.)

"an undue development of coloring material in the skin," especially in mammals or birds; the opposite of albinism (and the word probably based on it), by 1827; see melano- + -ism. Related: Melanistic.

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Definitions of melanism from WordNet

melanism (n.)
a condition characterized by abnormal deposits of melanin (especially in the skin);
Synonyms: melanosis
From wordnet.princeton.edu