What does apheresis mean?
The definition of apheresis
A*pher”e*sis, n.
Etym: [L. aphaeresis, Gr.

1 (Gram.)
The dropping of a letter or syllable from the beginning of a word; e. g., cute for acute.
2 (Surg.)
An operation by which any part is separated from the rest. [Obs.] Dunglison.