The presence of blood in urine, which can be visible (gross hematuria) or only detectable under microscopic examination (microscopic hematuria). It may indicate infection, kidney stones, trauma, or more serious conditions like cancer.
From Greek 'haima' meaning 'blood' and 'ouron' meaning 'urine,' literally meaning 'blood in urine.' The term has been used in medical literature since the recognition of blood as an abnormal urinary component.
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