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melanistic

melanistic, a.
  (mɛləˈnɪstɪk)
  [f. Gr. µελαν-, µέλας black + -istic.]
  Characterized by melanism.

1874 Coues Birds N.W. 357, I took no specimens in the melanistic state of plumage. 1888 O. Thomas Catal. Marsupialia Brit. Mus. 266 In the black melanistic variety every part of the body is deep black.

Oxford English Dictionary

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