Main Entry: aphe·re·sis

Pronunciation: \ˌa-fə-ˈrē-səs\

Function: noun

Inflected Form(s): plural aphe·re·ses \-ˌsēz\

: withdrawal of blood from a donor's body, removal of one or more components (as plasma, blood platelets, or white blood cells) from the blood, and transfusion of the remaining blood back into the donor—called also pheresis; see leukapheresis, plasmapheresis, plateletpheresis