dialysatePronunciation: /dʌɪˈalɪzeɪt/ (US also dialyzate)Definition of dialysate noun [mass noun] the part of a mixture which passes through the membrane in dialysis. the solution the dialysate forms with the fluid on the other side of the membrane. the fluid used on the other side of the membrane during dialysis to remove impurities. Origin: late 19th century: from dialysis + -ate1; the term originally denoted the part of the mixture which does not pass through the membranedialysate in other Oxford dictionaries Definition of dialysate in the US English dictionary