dialysis
‘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’
Lexical development traced from the Tamil root:
E. dialisis < Lat., Gk. dialysis ‘dissolution, separation’ < dialyein ‘dissolve, separate’ < dia ‘apart’ + Gk. lysis ‘a loosening’ < lyein ‘loosen’ < luh < leu- < Tamil aṟuttal