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pheresis

[fuh-ree-sis, fer-uh-]
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noun Medicine/Medical Informal.
  1. apheresis, especially plasmapheresis.

Origin of pheresis

probably by construal of plasmapheresis as plasma + -pheresis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
pheresis in Medicine

pheresis

(fə-rēsĭs, fĕrĭ-)
n.
  1. Apheresis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.