/ ˌdaɪˈæləsɪs; NAmE / noun
[ U ] ( technical ) a process for separating substances from a liquid, especially for taking waste substances out of the blood of people with damaged kidneys :
kidney / renal dialysis
a dialysis machine
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WORD ORIGIN
mid 19th cent.: via Latin from Greek dialusis , from dialuein split, separate, from dia apart + luein set free.