apheresis

Apheresis (Greek: "to take away") is a medical technology in which the blood of a donor or patient is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation. It is thus an extracorporeal therapy.
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Apheresis /aph·e·re·sis/ withdrawal of blood from a donor, with a portion being separated and retained and the remainder retransfused into the donor. [more]Apheresis - Community and Resources

Noun
1. (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until'
(synonym) aphaeresis
(hypernym) omission, deletion
(classification) linguistics
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
(synonym) pheresis
(hypernym) dialysis
(hyponym) plasmapheresis

(n.)
The dropping of a letter or syllable from the beginning of a word; e. g., cute for acute.
  

(n.)
An operation by which any part is separated from the rest.
  

A procedure in which blood is collected, part of the blood such as platelets or white blood cells is taken out, and the rest of the blood is returned to the donor. Also called pheresis.