• synonyms


[ mel-uh-noh-sis ]
/ ˌmɛl əˈnoʊ sɪs /

noun Pathology.

abnormal deposition or development of black or dark pigment in the tissues.
a discoloration caused by this.

Nearby words

melanomatosis, melanonychia, melanophage, melanophore, melanoplakia, melanosis, melanosis coli, melanosity, melanosome, melanospermous, melanotic

Origin of melanosis

1815–25; < New Latin < Late Greek melánōsis a becoming black. See melan-, -osis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for melanosis

  • In chronic cases the eventual effects are anaemia, melanosis, enlargement of the spleen and liver, and general cachexia.

    Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 4|Various

British Dictionary definitions for melanosis


melanism (ˈmɛləˌnɪzəm)

/ (ˌmɛləˈnəʊsɪs) /


pathol a skin condition characterized by excessive deposits of melanin
Derived Formsmelanotic (ˌmɛləˈnɒtɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for melanosis



1823, medical Latin, from Greek melanosis "a becoming black," from melanoun "to become black," from melas (genitive melanos); see melanin. Related: Melanotic.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for melanosis


[ mĕl′ə-nōsĭs ]


Abnormally dark pigmentation of the skin or other tissues, resulting from a disorder of pigment metabolism.melanism
Related formsmel′a•notic (-nŏtĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.