Medical Definition of dialysis
plural di·al·y·ses \-ˌsēz\play
1: the separation of substances in solution by means of their unequal diffusion through semipermeable membranes; especially : such a separation of colloids from soluble substances
2: either of two medical procedures to remove wastes or toxins from the blood and adjust fluid and electrolyte imbalances by utilizing rates at which substances diffuse through a semipermeable membrane:a: the process of removing blood from an artery (as of a kidney patient), purifying it by dialysis, adding vital substances, and returning it to a vein—called also hemodialysisb: a procedure performed in the peritoneal cavity in which the peritoneum acts as the semipermeable membrane—called also peritoneal dialysis
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