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apheresis

[uh-fer-uh-sis for 1; af-uh-ree-sis for 2]
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noun
  1. 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.
  2. 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.
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Origin of apheresis

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
Related formsaph·e·ret·ic [af-uh-ret-ik] /ˌæf əˈrɛt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for apheresis

apheresis

aphaeresis

noun
  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
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Derived Formsapheretic or aphaeretic (ˌæfəˈrɛtɪk), adjective

Word Origin

C17: via Late Latin from Greek, from aphairein to remove
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

apheresis in Medicine

apheresis

(ăf′ə-rēsĭs)
n.
  1. 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.hemapheresis
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.