the separation of substances in solution by means of their unequal diffusion through semipermeable membranes; especially : such a separation of colloids from soluble substances
hemodialysis
noun(he-mo-di-al-y-sis)
the process of removing blood from an artery (as of a patient affected with kidney failure), purifying it by dialysis, adding vital substances, and returning it to a vein —called also hemodialysis