antibody

[an-ti-bod-ee]
noun, plural antibodies.
1.
any of numerous Y -shaped protein molecules produced by B cells as a primary immune defense, each molecule and its clones having a unique binding site that can combine with the complementary site of a foreign antigen, as on a virus or bacterium, thereby disabling the antigen and signaling other immune defenses. Abbreviation: Ab
2.
antibodies of a particular type collectively.
Also called immunoglobulin.


Origin:
1895–1900; anti- + body

antibody, anybody (see usage note at anybody).
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World English Dictionary
antibody (ˈæntɪˌbɒdɪ)
 
n , pl -bodies
See also immunoglobulin any of various proteins produced in the blood in response to the presence of an antigen. By becoming attached to antigens on infectious organisms antibodies can render them harmless or cause them to be destroyed

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

antibody
"substance developed in blood as an antitoxin," 1901, a hybrid formed from anti- "against" + body.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

antibody an·ti·bod·y (ān'tĭ-bŏd'ē)
n.


  1. Abbr. Ab A protein substance produced in the blood or tissues in response to a specific antigen, such as a bacterium or a toxin, that destroys or weakens bacteria and neutralizes organic poisons, thus forming the basis of immunity.

  2. An immunoglobulin present in the blood serum or body fluids as a result of antigenic stimulus and interacting only with the antigen that induced it or with an antigen closely related to it.

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
antibody   (ān'tĭ-bŏd'ē)  Pronunciation Key 


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Any of numerous proteins produced by B lymphocytes in response to the presence of specific foreign antigens, including microorganisms and toxins. Antibodies consist of two pairs of polypeptide chains, called heavy chains and light chains, that are arranged in a Y-shape. The two tips of the Y are the regions that bind to antigens and deactivate them. Also called immunoglobulin.

Our Living Language  : Like other vertebrates, humans possess an effective immune system that uses antibodies to fight bacteria, viruses, and cancer cells. Antibodies are complex, Y-shaped protein molecules. The immune system's B lymphocytes, which are produced by the bone marrow, develop into plasma cells that can generate a huge variety of antibodies, each one capable of combining with and destroying an antigen, a foreign molecule. Antibodies react to very specific characteristics of different antigens, binding them to the top ends of their Y formation. Once the antibody and antigen combine, the antibodies deactivate the antigen or lead it to macrophages(a kind of white blood cell) that ingest and destroy it. High numbers of a particular antibody may persist for months after an invasion, eventually diminishing. However, the B cells can quickly manufacture more of the same antibody if exposure to the antigen recurs. Vaccines work by "training" B cells to recognize and react quickly to potential disease molecules.
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American Heritage
Cultural Dictionary
antibodies [(an-ti-bod-eez)]

Proteins in the blood that are produced by the body in response to specific antigens (such as bacteria). (See immune system.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
When that next puff does come, these antibodies intercept the nicotine
  molecules before they cross into the brain.
Those initial speculations were confirmed by applying antibodies to the tissue
  that are known to react with proteins.
Adult cobras are milked every few weeks, and small doses of venom are injected
  into horses, which develop antibodies to it.
The immune system works, in part, by making antibodies that are specific to
  particular sorts of hostile molecule.
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