Di·al·y·sis n.; pl. Dialyses
  1. Gram. Diæresis. See Diæresis, 1.
  2. Rhet. Same as Asyndeton.
  3. Med. (a) Debility. (b) A solution of continuity; division; separation of parts.
  4. Chem. The separation of different substances in solution, as crystalloids and colloids, by means of their unequal diffusion, especially through natural or artificial membranes.
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  dialysis
       n : separation of substances in solution by means of their
           unequal diffusion through semipermeable membranes
       [also: dialyses (pl)]