au·to·an·ti·bod·y

[aw-toh-an-ti-bod-ee, -an-tee-]
noun, plural au·to·an·ti·bod·ies. Immunology.
an antibody that an organism produces against any of its own tissues, cells, or cell components.

Origin:
1905–10; auto-1 + antibody

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
autoantibody (ˌɔːtəʊˈæntɪˌbɒdɪ) [Click for IPA pronunciation guide]
 
n , pl -bodies
an antibody reacting with an antigen that is a part of the organism in which the antibody is formed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Autoantibody has a plethora of syllables.
So is supercalifragilisticexpialidocious. Does it mean:
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
(used as a nonsense word by children to express approval or to represent the longest word in English.)
American Heritage
Medical Dictionary

autoantibody au·to·an·ti·bod·y (ô'tō-ān'tĭ-bŏd'ē)
n.
An antibody that attacks the cells and tissues of the organism in which it was formed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
autoantibody   (ô'tō-ān'tĭ-bŏd'ē)  Pronunciation Key 
An antibody that reacts with the cells, tissues, or native proteins of the individual in which it is produced. autoimmune diseases are caused by the presence of autoantibodies.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

autoantibody

harmful antibody that attacks components of the body called self antigens. Normally autoantibodies are routinely eliminated by the immune system's self-regulatory process-probably through the neutralization of autoantibody-producing lymphocytes before they mature. At times this process fails, and antibodies that react to self constituents proliferate.

Learn more about autoantibody with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The ultimate cause of the altered levels of autoantibody in anorexics and bulimics is unresolved as yet.
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