Pronunciation: (dī-al'u-sis), [key]
—pl. -sesPronunciation: (-sēz"). [key]
1. Physical Chem.the separation of crystalloids from colloids in a solution by diffusion through a membrane.
2. Biochem.the separation of large molecules, as proteins, from small molecules and ions in a solution by allowing the latter to pass through a semipermeable membrane.
3. Med.(in kidney disease) the process by which uric acid and urea are removed from circulating blood by means of a dialyzer.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.