di·al·y·sis (d - l  -ss)n. pl. di·al·y·ses (-s  z ) 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. Hemodialysis. [Greek dialusis, separating, dissolution, from dial  ein, to break up, dissolve : dia-, apart; see dia- + lein, to loosen; see leu- in Indo-European roots.]di a·lytic (- -ltk) adj.di a·lyti·cal·ly adv. |
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