cytapheresis

[sī′tə-fə-rēsĭs]
n.
  1. A procedure in which various cells can be separated from withdrawn blood and retained, with the plasma and other formed elements retransfused into the donor.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.