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nonself

[non-self]
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noun Immunology.
  1. any antigen-bearing foreign material that enters the body and normally stimulates an attack by the body's immune system (distinguished from self).
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Origin of nonself

First recorded in 1870–75; non- + self
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
nonself in Medicine

nonself

(nŏn-sĕlf′)
n.
  1. That which the immune system identifies as foreign to the body.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.