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he·mar·thro·sis or chiefly Brit hae·mar·thro·sis .hē-mär-'thrō-səs, .hem-är- n, pl -thro·ses -.sēz hemorrhage into a joint
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he·mar·thro·sis (he″mahr-throґsis) [hem- + arthrosis] extravasation of blood into a joint or its synovial cavity.Medical dictionary. 2011.