The excretion of urine of a dark color, resulting from the presence of melanin or other pigments or from the action of phenol, creosote, resorcin, and other coal tar derivatives. [melano- + G. ouron, urine]
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mel·an·uric -ik adj
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n.
the presence of dark pigment in the urine. This may be caused by the presence of melanin or its precursors, in some cases of melanoma; it may alternatively be caused by metabolic disease, such as porphyria.
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mel·an·uria (mel″ə-nuґre-ə) [melan- + uria] excretion of urine that is darkly stained or turns dark on standing. melanuric adjMedical dictionary. 2011.