[di.al.y.sis] n, pl -y.ses [NL, fr. Gk, separation, fr. dialyein to dissolve, fr. dia- + lyein to loosen--more at lose] (1861) 1: the separation of substances in solution by means of their unequal diffusion through semipermeable membranes; esp: such a separation of colloids from soluble substances
2: hemodialysis -- di.a.lyt.ic adj