The process of separating crystalloids and colloids in solution by the difference in their rates of diffusion through a semipermeable membrane, crystalloids pass through readily, colloids very slowly or not at all.


A medical procedure that uses a machine to filter waste products from the bloodstream and restore the bloods normal constituents.

A necessary form of treatment in the patient with end-stage renal disease. In most circumstances, kidney dialysis is administered in a fixed schedule of three times per week.

See: haemodialysis.

Origin: Gr. Lysis = dissolution

(26 Nov 1998)