Etymology
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melanosis (n.)

"abnormal deposition of pigmentary matter in organs or parts of the body," by 1815, medical Latin, from Greek melanosis "a becoming black," from melanoun "to become black," from melas (genitive melanos); see melano-. Related: Melanotic.

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Definitions of melanosis

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