Definition of "melanosis" []

• Abnormally dark pigmentation of the skin or other tissues, resulting from a disorder of pigment metabolism. Also called melanism. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It is possible the cat has iris melanosis, which is different from iris melanoma."
• "Besides, it is possible for cats to function just fine with iris melanosis."
• "We are in trouble just now, on account of a neglected hereditary _melanosis_, as Monsieur Trousseau might call it."