Abnormal dark brown or brown-black pigmentation of various tissues or organs, as the result of melanin or, in some situations, other substances that resemble melanin to varying degrees; e.g., m. of the skin may occur in widespread metastatic melanoma, sunburn, during pregnancy, and as a result of chronic infections. [melano- + G. -osis, condition]
- m. coli m. of the large intestinal mucosa due to accumulation of pigment of uncertain composition within macrophages in the lamina propria.
- neurocutaneous m. cutaneous giant pigmented nevi associated with m. of the leptomeninges; malignant melanomas may develop in the skin or meninges.
- oculodermal m. pigmentation of the sclera and skin around the eye, usually unilateral; seen especially in women of Asian descent. SYN: Ota nevus.
- pustular m. a transient, benign, pustular rash of unknown etiology seen in neonates; leaves a hyperpigmented base when the pustule resolves.
- Riehl m. a brown pigmentary condition of the exposed portions of the skin of the neck and face with melanin pigment in dermal macrophages, thought to result from photodermatitis due to materials, such as cosmetic ingredients, or oils encountered in various occupations.

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mel·a·no·sis .mel-ə-'nō-səs n, pl -no·ses -'nō-.sēz a condition characterized by abnormal deposition of melanins or sometimes other pigments in the tissues of the body

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2. a disorder in the body's production of the pigment melanin.
3. cachexia associated with the spread of the skin cancer melanoma.
melanotic adj.

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mel·a·no·sis (mel″ə-noґsis) [melan- + -osis] excessive pigmentation of part of the body owing to a disturbance in melanin pigmentation; called also melanism.

Medical dictionary. 2011.

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Look at other dictionaries:

  • Melanosis — Classification and external resources MeSH D008548 Melanosis is a form of hyperpigmentation associated with increased melanin.[1] It can can refer to …   Wikipedia

  • melanosis — f. patol. Alteración del color normal de los tejidos por depósitos de melanina u otros pigmentos. Medical Dictionary. 2011. melanosis …   Diccionario médico

  • melanosis — (n.) 1823, medical Latin, from Gk. melanosis a becoming black, from melanoun to become black, from melas (gen. melanos); see MELANIN (Cf. melanin). Related: Melanotic …   Etymology dictionary

  • melanosis — [mel΄ə nō′sis] n. [ModL < Gr melanōsis, a becoming black < melanousthai, to become black < melas: see MELANO ] the abnormal production and deposition of melanin in the body tissues melanotic [mel′ənät′ik] adj …   English World dictionary

  • Melanosis — Mel a*no sis, [NL., fr. Gr. ? a growing black, fr. me las, me lanos, black.] (Med.) The morbid deposition of black matter, often of a malignant character, causing pigmented tumors. [1913 Webster] …   The Collaborative International Dictionary of English

  • Melanosis — Melanosis, griech., Schwarzsucht; die krankhafte Umänderung des Blutroths (Hämatins) in schwarzen Farbstoff …   Herders Conversations-Lexikon

  • melanosis — (Del gr. tardío μελάνωσις, ennegrecimiento). f. Biol. Alteración de los tejidos orgánicos, caracterizada por el color oscuro que presentan …   Diccionario de la lengua española

  • melanosis — (Del gr. melas, negro + osis, enfermedad no inflamatoria.) ► sustantivo femenino 1 MEDICINA Oscurecimiento anormal de los tejidos orgánicos, en especial de la piel, por acumulación de melanina. IRREG. plural melanosis 2 AGRICULTURA Enfermedad de… …   Enciclopedia Universal

  • melanosis — /mel euh noh sis/, n. Pathol. 1. abnormal deposition or development of black or dark pigment in the tissues. 2. a discoloration caused by this. [1815 25; < NL < LGk melánosis a becoming black. See MELAN , OSIS] * * * …   Universalium

  • melanosis — melÉ™ nəʊsɪs n. skin disease characterized by abnormal deposits or development of dark pigment in the skin; discoloration caused by melanosis …   English contemporary dictionary

  • melanosis — mel•a•no•sis [[t]ˌmɛl əˈnoʊ sɪs[/t]] n. pl. ses [[t] siz[/t]] 1) pat abnormal deposition or development of black or dark pigment in the tissues 2) pat a discoloration caused by this • Etymology: 1815–25; < LGk melánōsis a becoming black. See… …   From formal English to slang

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