n. pl. di·al·y·ses (-sēz′)
1. The separation of smaller molecules from larger molecules or of dissolved substances from colloidal particles in a solution by selective diffusion through a semipermeable membrane.
2. Medicine Any of several techniques, especially hemodialysis and peritoneal dialysis, in which filtration through a semipermeable membrane is used to remove metabolic wastes and excess fluid from the blood of people with kidney failure.
[Greek dialusis, separating, dissolution, from dialūein, to break up, dissolve : dia-, apart; see DIA- + lūein, to loosen; see leu- in the Appendix of Indo-European roots.]
di′a·lytic (-ə-lĭtĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.