Dialysis

Chamber's Etymological of the English Language · 1895 · p. 134

dT-al'i-sis, n. chem the separation of substances by delusion through a membranous septum or partition: dneresis pi Dialyses, — dT-al i-sez adj. Dialyt'iC. [Gr. dialysis—dia, asunder, and lyb, to loose.]