Medical Dictionary


noun di·al·y·sis \dī-ˈal-ə-səs\
plural di·al·y·ses \-ˌsēz\

Medical Definition of DIALYSIS

:  the separation of substances in solution by means of their unequal diffusion through semipermeable membranes; especially :  such a separation of colloids from soluble substances
:  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 hemodialysis b :  a procedure performed in the peritoneal cavity in which the peritoneum acts as the semipermeable membrane—called also peritoneal dialysis
di·a·lyt·ic \ˌdī-ə-ˈlit-ik\ adjective
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