an eruption of velvet warty benign growths and hyperpigmentation occurring in the skin of the axillae, neck, anogenital area, and groin; in adults, may be associated with internal malignancy, endocrine disorders, or obesity; a benign (juvenile) type occurs in children. See Also: pseudoacanthosis nigricans. Syn: keratosis nigricans.
[L. fr. niger, black]