hemofiltration
noun
he·mo·fil·tra·tion
variants:
or chiefly British haemofiltration \ ˌhē-mō-fil-ˈtrā-shən 
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Medical Definition of hemofiltration
: the process of removing blood from the living body (as of a kidney patient), purifying it by passing it through a system of extracorporeal filters, and returning it to the body