That part of a mixture that passes through a dialyzing membrane; the material that does not pass through is referred to as the retentate. SYN: diffusate.
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di·al·y·sate (di-alґə-sāt) 1. the fluid and solutes in a dialysis process that simply flow through the dialyzer and do not pass through the semipermeable membrane, being discarded along with removed toxic substances after they flow back out of the dialyzer. 2. diffusate (def. 2).Medical dictionary. 2011.