We don't have synonyms for melanuria yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are melanuric, melanemia and melanesia.
(n) :
(medicine) The excretion of urine of an abnormally dark colour, caused by the presence of melanin or other pigments or by the action of phenol, creosote, resorcin, and other coal-tar derivatives.
(n) :
(medicine) The excretion of urine of an abnormally dark colour, caused by the presence of melanin or other pigments or by the action of phenol, creosote, resorcin, and other coal-tar derivatives.