Synonyms for Apheresis (same or very similar meaning)
WordNet sense 1 ((linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until'):
aphaeresisWordNet sense 2 (a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion):
pheresisFrom the ODE community, based on WordNetadd/edit