- abnormal deposition or development of black or dark pigment in the tissues.
- a discoloration caused by this.
- pathol a skin condition characterized by excessive deposits of melanin
n.1823, medical Latin, from Greek melanosis “a becoming black,” from melanoun “to become black,” from melas (genitive melanos); see melanin. Related: Melanotic. n.
- Abnormally dark pigmentation of the skin or other tissues, resulting from a disorder of pigment metabolism.melanism