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Wordnet 3.0

NOUN (1)

1. separation of substances in solution by means of their unequal diffusion through semipermeable membranes;


The Collaborative International Dictionary of English v.0.48:

Dialysis \Di*al"y*sis\, n.; pl. Dialyses. [L., separation, fr. Gr. ?, fr. ? to part asunder, dissolve; dia` through + ? to loose.] 1. (Gram.) Di[ae]resis. See Di[ae]resis, 1. [1913 Webster] 2. (Rhet.) Same as Asyndeton. [1913 Webster] 3. (Med.) (a) Debility. (b) A solution of continuity; division; separation of parts. [1913 Webster] 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. [1913 Webster]
WordNet (r) 3.0 (2006):

dialysis n 1: separation of substances in solution by means of their unequal diffusion through semipermeable membranes