autoimmune

[aw-toh-i-myoon]
adjective Immunology.
of or pertaining to the immune response of an organism against any of its own tissues, cells, or cell components.

Origin:
1950–55; auto-1 + immune

autoimmunity, noun
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World English Dictionary
autoimmune (ˌɔːtəʊɪˈmjuːn)
 
adj
(of a disease) caused by the action of antibodies produced against substances normally present in the body
 
autoim'munity
 
n

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American Heritage
Medical Dictionary

autoimmune au·to·im·mune (ô'tō-ĭ-myōōn')
adj.
Of or relating to an immune response against one of the body's own tissues or cells.


au'to·im·mu'ni·ty n.
au'to·im'mu·ni·za'tion (-ĭm'yə-nə-zā'shən) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Conversely, adding them back can make them less likely to suffer from
  autoimmune diseases.
It is an autoimmune disorder, which means the body mistakenly attacks healthy
  tissue.
It is an autoimmune condition in which white blood cells destroy the pancreas's
  insulin-producing cells.
But for the majority of patients with ulcerative colitis, an autoimmune
  disorder, the decision is not so obvious.
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