[uh-fer-uh-sis for 1; af-uh-ree-sis for 2]
Also, aphaeresis. the loss or omission of one or more letters or sounds at the beginning of a word, as in squire for esquire, or count for account.
Medicine/Medical. the withdrawal of whole blood from the body, separation of one or more components, and return by transfusion of remaining blood to the donor.

1605–15; < Late Latin aphaeresis < Greek aphaíresis a taking away, equivalent to aphairé(în) to take away (ap- ap-2 + haireîn to snatch) + -sis -sis

apheretic [af-uh-ret-ik] , adjective
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World English Dictionary
apheresis or aphaeresis (əˈfɪərɪsɪs)
1.  the omission of a letter or syllable at the beginning of a word
2.  a method of collecting blood from donors that enables its different components, such as the platelets or plasma, to be separated out
[C17: via Late Latin from Greek, from aphairein to remove]
aphaeresis or aphaeresis
[C17: via Late Latin from Greek, from aphairein to remove]
apheretic or aphaeresis
aphaeretic or aphaeresis

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American Heritage
Medical Dictionary

apheresis aph·e·re·sis (āf'ə-rē'sĭs)
A procedure in which blood is drawn from a donor and separated into its components, some of which are retained, such as plasma or platelets, and the remainder returned by transfusion to the donor. Also called hemapheresis.

The American Heritage® Stedman's Medical Dictionary
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