a medical procedure in which blood is taken from a donor or patient, the plasma is separated from the blood cells in a centrifuge, and the blood cells are returned to the person's circulatory system
See plasmapheresis in American Heritage Dictionary 4
(plăzˌmə-fĕrˈĭ-sĭs, -fə-rēˈ-)
noun
A process in which plasma is taken from donated blood and the remaining components, mostly red blood cells, are returned to the donor.