Melanism /(mĕl"ȧ*nĭz'm)/

Mel·a·nism

Melanism

n.
  1. An undue development of dark-colored pigment in the skin or its appendages; -- the opposite of albinism.
  2. A disease; black jaundice. See Melaena. (Med.)

Melanism

n.
  1. The character of having a high degree of pigmentation, as shown in dark skin, eyes, and hair. (Ethnol.)