n.
Pronunciation: ˌ a-f ə - ' r ē -s ə s
Function: noun, plural
Inflected Form: -re · ses \ - ˌ s ē z \
Etymology: from -apheresis (as in plasmapheresis )
Date: 1977
: withdrawal of blood from a donor's body, removal of one or more blood components (as plasma, platelets, or white blood cells), and transfusion of the remaining blood back into the donor ― called also pheresis