| melaena | (noun) abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding) | Synonyms: melena |
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| melagra | (noun) rheumatic or myalgic pains in the arms or legs | - |
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| melamine | (noun) a white crystalline organic base; used mainly in making melamine resins | Synonyms: cyanuramide |
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| melancholia | (noun) extreme depression characterized by tearful sadness and irrational fears | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| melancholic | (noun) someone subject to melancholia | Synonyms: melancholiac |
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| melancholy | (noun) a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy | Synonyms: black bile |
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| (noun) a feeling of thoughtful sadness | - |
| (noun) a constitutional tendency to be gloomy and depressed | - |
| melange | (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
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| melanin | (noun) insoluble pigments that account for the color of e.g. skin and scales and feathers | - |
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| melanism | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanosis |
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| melanoblast | (noun) an epidermal cell that is a precursor of a melanocyte | - |
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| melanocyte | (noun) a cell in the basal layer of the epidermis that produces melanin under the control of the melanocyte-stimulating hormone | - |
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| melanoderma | (noun) abnormally dark skin caused by increased deposits of melatonin | - |
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| melanoma | (noun) any of several malignant neoplasms (usually of the skin) consisting of melanocytes | Synonyms: malignant melanoma |
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| melanosis | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanism |
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| melasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: chloasma, mask of pregnancy |
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| melatonin | (noun) hormone secreted by the pineal gland | - |
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